Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd8ee4eb9a4404d…

MALICIOUS

PDF

84.3 KB Created: 2021-08-16 15:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: a5c3d5b817c8e7d6b55c3f2363e31e2d SHA-1: f874fb7baa853a57c78f6a331252e26f635196ea SHA-256: 9cd8ee4eb9a4404d2bae4468691e691399dffa4c724b218c284f608339774f3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=hoja+de+dos+lineas+para+imprimir PDF link annotation
    • https://senhewood.com/d/files/vobunadenebopevak.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090b91cd423a---13702531249.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b41de8e077f95c1fa3ba371025ca686b/repazu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/34136010720.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1627898018.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cfc2454839dcff0fd43606642bc43f2a/20620011214.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9c002d05f41beddf85cbbaef5dae6883/49200294736.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/47910237787.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/deaba3m60kbgbuonqh8s0a4lil/19458050357.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/34711491089.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a87kdflsdiabg55nv8snaht5c4/19685691095.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d38657662ca3c5cf3bb84f64836876fc/zevutakuzafuzusew.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/138a85aaa900ddef93106537f4b38e0b/99772835701.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fe416bd3---75481186327.pdfIn PDF document text
    • http://allasclub.com/campannas/file/lafazamazerilipedeveti.pdfIn PDF document text
    • https://nasikampung.info/contents//files/sututetopafumosesegaxi.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/nogimujus.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/zadex.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/sulofafatodezivifabotex.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/50175964680.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/xofudurisedidavut.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c1f1f50ce9c26aa236eaa634292b8bb9/10682062745.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d828d478541---73753011578.pdfIn PDF document text
    • http://kustari.net/userfiles/file/35141014277.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f010d6e2f09e976214b05c9d6913024a/782721185.pdfIn PDF document text
    • 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_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 17864 bytes
SHA-256: 9943f47e2cd54cf06c861fb20160e32919a95a1791c0bd40816bfcdfbd67c30e
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 10576 bytes
SHA-256: 04cdac6f00903f17c308d1ac968f2e0d9d5fc746491915ab60ff983670b3016d
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1