Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f8582da2a0bcf5…

MALICIOUS

PDF

117.1 KB Created: 2021-07-10 06:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 698559d651f5cba9fca50aefef7f7bcd SHA-1: 785ea3820953651d93f762f9947273ec22c22371 SHA-256: c5f8582da2a0bcf52b4e8282b48703dea291765329b470023e88964bc25e9e48
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it is an advance-fee scam lure. The document contains numerous links to external PDF files hosted on various websites, likely serving as a link farm to distribute the scam content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac774862f40---suzirutudev.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/fm96027gnr4iqh6a0i4c3a146d/vudiw.pdf
    • http://alimentosldm.com/userfiles/file/37644180834.pdf
    • https://susta.vn/userfiles/file/ziporati.pdf
    • http://sportgalaktik.sk/userfiles/file/galufotuditapupo.pdf
    • http://lycee-elm.org/userfiles/file/44595952101.pdf
    • http://piazzademarini3ge.com/userfiles/files/35763654101.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54203ed6d---vizil.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/14d95db15ea4525924fc268a9babedf8/figufodazu.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/90e875f0bc2bdd2b964289474a42fee5/fekaw.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/23af9cb2036db8a5e493892966e65aa8/1748946878.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc613c6186---rowujufefiselezifabi.pdf
    • https://vanrun-it.nl/userfiles/files/tapujurafumol.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/38713413028.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/63874921988.pdf
    • http://ratchadatitan.com/UserFiles/File/diriserefototeze.pdf
    • http://ahcxdq.com/uploads/file/281858567237.pdf
    • http://www.asslar.de/downloads/47430171179.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ntfvd4mmct17huj6b32c8435tn/1638065347.pdf
    • https://permargi.com/files/galeria/files/37005136677.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/gekodezofawoxi.pdf
    • https://micro-churches.net/uploads/file/fobiporevuzogekefatigivex.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8fb5f0b2---nexosamawakiponavewi.pdf
    • http://vdadanang.vn/app/webroot/assets/files/35374940923.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+many+glasses+in+a+jeroboam
    • 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_off0001620c.bin
b2d477baf1d47c43427cd09a63e58886703f8f029bc532edd78acca1a7c35248
pdf-font-stream PDF embedded font (sfnt) at offset 0x1620C 21048 bytes
font_01_sfnt_off0001966f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1966F 16792 bytes
font_02_sfnt_off0001ae86.bin
80e138e6ce2bbefd9c8395d49ba963415528301e4cf3dc92eb8332feb287dceb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE86 10812 bytes