Malicious PDF — malware analysis report

Static analysis result for SHA-256 691747752efb5127…

MALICIOUS

PDF

138.1 KB Created: 2021-06-22 09:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ab24d1e5b8d4d7a64ffe01ee710d5312 SHA-1: db4affa510af7d9a30a43ea712a897c31eacb60b SHA-256: 691747752efb5127f94d9a3ca9712e4a68a5354cdbb693da05c7a2ed9baf3249
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains references to downloading mp3 files, which could be a lure for users seeking content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://carszana.com/image/upload/File/63576684741.pdf In PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/051c03c1ae45635d3b17b7bf60f81805/toradapenosemenekibusuwu.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/fapivon.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ae8599f6f---20657079360.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/73036105436.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/tobomorugokuzamofiji.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ef194d5699b762443a3d5d7e4712657c/tesamoruxevizexakadusof.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file/%5C/2021621231497201.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/21982670675.pdfIn PDF document text
    • https://ubranni.com/uploader/files/sajijakukemugerex.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b7c31ce02199d1fc109829df935fd052/timetuninigitatom.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bcb46a038---revul.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb0828d545---renufevasutofekogilaruv.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/dasavep.pdfIn PDF document text
    • https://datajournonepal.org/files/kumopuwiduna.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h7e59rgucbj0t80io6656v71g2/fowevewexiredu.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hanuman+chalisa+by+unnikrishnan+mp3+downloadPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001e1be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1E1BE 19300 bytes
SHA-256: 82204199ebd6f0291d73d12e05ca4dd5b212610b0f71b61b957f3dbecc7092a1
font_00_sfnt_off000192ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192EA 5836 bytes
SHA-256: 7cfb05b656a94ee8f50ae11afa575c5ec329a01e2da8e3f3ecffe0ab10a9a71e
font_01_sfnt_off0001a6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6A7 3772 bytes
SHA-256: e2c7bb3c6d2fbc6b9680c858ce58af9e5cd0e4fbc18f33bdd2ad1d5654d08a87
font_02_sfnt_off0001b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B24B 15740 bytes
SHA-256: 5f491c315bdcf7f4c7e36bf3f079fe62a2ee3ec0f1e96ac67e794e2c5333c93b

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