Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94d58f8e0c127e5…

MALICIOUS

PDF

92.8 KB Created: 2021-08-06 23:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1abe28a9951259e24fbcc555c5ac95bd SHA-1: fdbb44bf7486ac190dacdbe14a2eed7a3ce82cf0 SHA-256: a94d58f8e0c127e505379e3ac420de8693bdb9da61e20359cd9eb346fea0e19c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of malformed streams and external URIs indicates exploitation or redirection attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2544b336882a26b2b443a0980bcce55a/60336070852.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/aa74411e7056b7382d278f0c5c5ca642/91561436139.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3c8ca2bd68bdc1b12cf6d9a256447c1c/90164602097.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/320027bfd02c34ebe3a0a51d26feffb9/94934758602.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ee92a480a---1539317281.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/89720769547.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/vopeboxafi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d066fffee6dfae805da381f530c56ce2/68599628097.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/36407189140.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c8e726c52---bovitexopitimo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/ropejuxirabagipopinalulef.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160866b05332bb---varodemagenumidum.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/d10bc3d1ae46b32245c30c7e1d34d38b/tizugagugopaxok.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe1451a3b---jezamesawuxafo.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/55452113716.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/45e0604536d6c2d9de43a31481ef5ff3/98797409213.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/80650767577.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/kigabumafigerisejewu.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/95675597199.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e9c1gp1c0hktojffqkpc3enr87/tuxarutenebodoleguv.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/86926257954.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdbff4a10c---kexowolujepudasubaduwiz.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0109203c---kumupozoxi.pdfIn PDF document text
    • http://juha.be/_files/file/81494993925.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/5359925005.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/54dcb5a12ae0ff49da399c7516866002/govubigadimirujagafan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+connect+my+bluetooth+soundbar+to+my+roku+tvPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 11132 bytes
SHA-256: 12601f5ca3173674f24003bb04662405e0108ce626d38a4cfd0129dd81ea7465
font_01_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 17224 bytes
SHA-256: 0ec823a3e1d5f73a5c13ce7d0877aa121a4c47e7f5db4b0ac0507a165b1ef459

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