Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef9320e46da7671…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 10:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8db845889a0c3c8cddbf7fcf689a3182 SHA-1: f44d0ec2f3e43255c55079144e2fdb24ae07a151 SHA-256: 4ef9320e46da7671376107eb668ab056007c0dced5bc1aed2a453355bc070fbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of 'link farm' heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://avstralianature.ru/ckfinder/userfiles/files/54704858296.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e480587d9---98563942930.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/65300029697.pdf
    • https://arab-hams.com/Ups/files/87015609787.pdf
    • http://cameragiaminh.com/upload/files/jaxefakeselezavafemabut.pdf
    • http://culfordequestriancentre.org/UserFiles/file/55487461104.pdf
    • http://taihegas.com/filespath/files/20210831072520.pdf
    • http://telesson.net/_UploadFile/Images/file/limuxegumerugimovekib.pdf
    • http://netart.hu/userfiles/file/tusuxeloreletabusezipebu.pdf
    • http://szakkepzosiklos.hu/upload/file/66730787620.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/50b11c4910ecc8ba1c56f1bc19621021/lotebadif.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613843d08acb1---zogad.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1691d115---13734737848.pdf
    • http://parfumland.sk/upl/74243325875.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/62849732271.pdf
    • https://samarpanbharat.org/trila/userfiles/file/84537968825.pdf
    • http://ototavandosemesi.com/resimler/file/33326537033.pdf
    • https://www.shinoda-usa.com/ckfinder/userfiles/files/xudodigawemakajudolob.pdf
    • http://dpsszczytno.pl/photo/file/fuvadidoxeto.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff2eab1ff---jafaraze.pdf
    • http://duhochoangthanh.com/upload/files/34272298282.pdf
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/gepafosotojufojunapukus.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33397b2c8b---68289488298.pdf
    • http://hladonural.ru/upload_picture/78521608930.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=converter+arquivo+rar+em+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf0.bin
4c23e06caca0046f186feba5fa3d3ef242830154903badb83e8fe78b21ee4c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 18816 bytes
font_01_sfnt_off0000f9f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 16792 bytes
font_02_sfnt_off0001120d.bin
e780113e8a9097cb19a2f153c9105adefc3e0fc32450014f5b12f346985d8e7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 10788 bytes