Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d80da4457cbb392…

MALICIOUS

PDF

161.6 KB Created: 2021-07-07 22:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2716868ac7ca86188bfe8f4a9c407aaa SHA-1: fb88cd8b139f3bc203a6ffd957926bd59de71eed SHA-256: 7d80da4457cbb392b92f32a7378c41a91d6776160a28d01a2af27f0de83085a4
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it is a link farm on compromised CMS uploads and a lure for payment redirection or secret recovery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into revealing sensitive information or redirecting payments, aligning with phishing and business email compromise tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

Heuristics 8

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e999fd0bae---92730790607.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d25f8cde487---75547093845.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/43795792811.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/54ce909f88bbee6e56feba15dd120f4f/dimosugazepadili.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160940ff0402bc---15278685951.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9bcd035cf---96604757225.pdf
    • http://crabandclaw.com/uploads/files/guvanememudaboxosud.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/5735593ded9e012aadc0b5f80caa180f/6405895608.pdf
    • http://renovfab-menuiserie.com/userfiles/file/redatuka.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e9a7f586---filulusigilakona.pdf
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/felevid.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b6a571735aa5a57d9722017d3733b83e/zafezi.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cb3d55985219d24d7346f80245c806d2/93190443220.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/p05hk8olqlmkumgh3fnch78qif/bipitugalafes.pdf
    • http://npi-management.com/ressource/site-image/files/7868971529.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/64t55vsva59788d70fh2n0ssn7/45126994969.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8bf2a01e8---1536509976.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/kvi4pnvbe0o6gth48th9bafqsd/pajitavodepelenanozeji.pdf
    • https://elektrona.cz/files/file/mofarudikerobod.pdf
    • http://euro-ex.net/images/blog//file/64986069614.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fd750e882ae6005b9f944c132c4ed7b0/29977924378.pdf
    • https://alshamiltrading.com/alshamilfiles/file/64879116709.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb249ada48---tosuxapaw.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6a99cac1cf669350d354659021080714/75948639869.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd2d0e1a57---sepotofitabokujava.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=decrypt+caesar+cipher+without+key
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001811a.bin
7ea216c18ef70fe20422d125518d87eaa13aff9a340eda9eed63207ae40146ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1811A 54280 bytes
font_01_sfnt_off00021483.bin
0b6c0664d27af3790efb1afedb765534fa80e24db85c1ee4c22986484adb1977
pdf-font-stream PDF embedded font (sfnt) at offset 0x21483 10712 bytes
font_02_sfnt_off00022d64.bin
e00dcb2c0c110edb3d059aeb240aaa4b84fd639838aed5afed6c714cc62f587f
pdf-font-stream PDF embedded font (sfnt) at offset 0x22D64 18060 bytes
font_03_sfnt_off00025cf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x25CF8 16792 bytes