Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acf7255f1ccd6a6…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 05:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16645e68301772decd3ebd876d87ef8b SHA-1: 5f1e918d976139df50b9fe50201e8061bc4f11d4 SHA-256: 1acf7255f1ccd6a63b1f831657d1d78e31ce8ceee279179220f60b4ccd8ded53
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/do6hfclmudfc6itu0asos5bctr/40175030322.pdf
    • https://a2designbg.com/userfiles/file/zitorebevofixozosiw.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4e2ee8e1f7dcccf2af7fa82e43f47209/mowes.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c65852754---74708544883.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8032eed85---75043195065.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071e4eceda02---biboremadamisufilodiw.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d87f64ca54---39256051979.pdf
    • https://bushregenerators.biz/userfiles/files/pumifiguzewa.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/25097763ec3e6e3af6b4e12643188bdc/dukosawol.pdf
    • https://abugfreemind.com/userfiles/file/zudavekebefu.pdf
    • http://come2menorca.com/images/file/gonudujajop.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8806cfd97---17509264875.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14d0eceedd---fuxevapikegamujadopafam.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec9cce1d90---veropoxosub.pdf
    • http://rosesrealtyhomes.com/userfiles/files/45814467725.pdf
    • https://alatheir.com/atheirwsfiles/file/80205320288.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e4849d3629edf90a80627619e6d61106/lifurovarotaxakimisuwolox.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1cfb1b482f3dae6e361c0edbbdc5a8d5/gejuxofana.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d8bc30aea---9707769921.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c73f036b---45627442267.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/luwamarusekola.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e0b2fec0bfc4ac809ba9f45cd2602c6c/25850353400.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vqqm9tnifnoefckfal879akbq3/marujokuwitewos.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff577d226---38779261660.pdf
    • http://aldara-latinoamerica.com/userfiles/file/vawegamebusuzipefumiv.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c53ff8efeb---21373043133.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0mh5m2s465o9c1201mrjlo817c/8107999142.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=doxt+sl+for+acne
    • 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_off0000ec93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 16792 bytes
font_01_sfnt_off000104a5.bin
adc2c11046fdf9db49c5522bfdb99dcdf1335b6958a7de706de0d2ecb640b0db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 16560 bytes
font_02_sfnt_off00012f88.bin
db961dfc3bbd82dcd74033f67d6f649efd99e1ffc9ef21a0e5d943c05e513ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 10340 bytes

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