Malicious PDF — malware analysis report

Static analysis result for SHA-256 518ec10e7c5035f8…

MALICIOUS

PDF

84.6 KB Created: 2021-07-29 20:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 136417d01c16dc9c6a3e0d67082acb7f SHA-1: 234f30f49e745e2948b6ce629350dc1e4854a29e SHA-256: 518ec10e7c5035f83461ecbdf180e5fa0336ae7b7a4d56eeaca4d51785a8428f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, with several hosted on compromised or disposable domains, indicating a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to delivering a trojan or phishing content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://vagtteam.dk/userfiles/Files/zutorokibulovemozu.pdf In PDF document text
    • https://songhong-thudo.com/img/files/zawibamuvomawofofinilesus.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/37077479038.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/74568796249.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/mujufepibe.pdfIn PDF document text
    • http://netflor.pl/upload/File/tutiraluguk.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/darejoki.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/dafaxeguvorupiwenubor.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/pubaw.pdfIn PDF document text
    • https://okvino.it/file/61010594333.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c84f1bd9---67421638136.pdfIn PDF document text
    • https://yuss.it/file/bozokonit.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/98207924895.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab644a5d132---peruregolonevilubesimag.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/21603194802.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa5dd43631---nifisojumon.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b058914afc3---38049406613.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/tamolasinuwon.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160781a2078554---bugakefasisileji.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e6e125ce6cb02dab8969f8b08ec7200f/378232085.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/larawitejakada.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/laxifavurebekopedan.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/85432992129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+connect+logitech+k520+keyboard+to+macPDF 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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 17244 bytes
SHA-256: 363b2cbff3db493f7b1839108f03444e70e39db488003dec16b5e08b36d404a4
font_02_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 11448 bytes
SHA-256: d0e5ce6ea6928d2f6340d09827e0b10fcbad2a029ca62823e0a53c11e0eced77

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