Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a501124386f475a…

MALICIOUS

PDF

92.7 KB Created: 2021-10-07 07:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9c493cbe9190672c5a3ccc1423c41bf9 SHA-1: 7c9d8dd12ae44e8b5b13b39a25eea4c55c8f66f9 SHA-256: 0a501124386f475af0bb57d1565b6620304641f7d7e5b7cae70a03eee90b6bbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple websites, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link farm designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o3vf27td0241tjpgtms5nocis1/96804261568.pdf In PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/10541788930.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/namemevogirojo.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/61393148264.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/95a49904953110414259cd505fc9ed49/nunotavinem.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3d9538b56---suxivakonosijoketatebubag.pdfIn PDF document text
    • http://mrybalko.ru/files/vikulitibuvawexuta.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40599741509.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/65536738540.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/21114613317.pdfIn PDF document text
    • http://humanlitech.com/files/files/24327053112.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/mebuzafozitijaxonas.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/2338611628.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/68d2bec8b9858d903b7f251a6fc86480/10919093817.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/gelop.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/53249299301.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7498c0c8f---23350935877.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/kitawonazikikegapoku.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/52007889928.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/dexeporurexebuzixurane.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/dowogokixowonipem.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/rivetevufutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=animals+that+live+in+temperate+grasslandsPDF 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_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 10764 bytes
SHA-256: 9d0b8a1b65a7caac4b0bf4ee080ee44e6cb7771ca7b9578e04233a7094b8b20c
font_01_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001329e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329E 19296 bytes
SHA-256: 4042bff5e801a89630cd94939cdae65daf2c5896cddd07041b2ff493f82ffb63