Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bea44971642c7f…

MALICIOUS

PDF

66.5 KB Created: 2021-05-10 07:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56b3b93f2fbcc750ee5d2842e7046f17 SHA-1: 8dd8eb6919fb19a500678a38eb247c7533407b8d SHA-256: 52bea44971642c7fd2a28d2d85c2b0fbaba6bb66757b01cc36517c88d903efd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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://smidgel.ru/uplcv?utm_term=geometry+worksheet+2.+1+conditional+statements+answers
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b998cf3f24---84505497915.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd451cba55---96292394392.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/5a180b5005481bff684d6382b318cdec/zamexezilawusojarolorufen.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160730b4a09c4d---movop.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160865b10d1683---zivasox.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d10b86f9a---zumotejanox.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea580c935---12894306437.pdf
    • http://softwarefactory.nl/images/file/23480318084.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5628e531---10782235328.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160814201d827a---gojuvimujitegetom.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160893602aa260---juwixitegixoreduxak.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089cdd9a5099---sazaselajonafuredufaroj.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7nida6nucjpc8m5k206gg9lrpo/80338066726.pdf
    • https://aquafilling.com/userfiles/file/jelizawesaruwukajidiviz.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ltlepr6fk61n297ag4kgtcvqi0/26644580310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ca82b64f26e9d1ff40bb19febbd147a1/gunupeserowil.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc1.bin
af961e08e1f456bdd532f2cc8b99fd7b8c5f599a351e1acaec8f38d7cc34a3b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 5684 bytes
font_01_sfnt_off0000e30f.bin
0ad24f864b238fec0eb04ffa388542bdc68988630adeaf6f17ac1aa834c1d399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 10284 bytes

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