Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b121df37f1af4f…

MALICIOUS

PDF

93.3 KB Created: 2021-07-08 10:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1f63d3e0feaf15aefda7831a468c3534 SHA-1: 8fcf7c41f142652116d31155a99f7dd10939dec0 SHA-256: c5b121df37f1af4fbeb1e069d5b01d6cb4afd6c9b41d8d8f24c493c48276a8c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://trimix.bg/UserFiles/File/1072806347.pdf In PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/77469887987.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862a533d547---60906882092.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/8o8polcv2cnpjogt46ghmdflsr/masudi.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/guv04u6rl5n1rv5npgc3m1vil5/zijizuriboluj.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/82553214949.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/82622852993.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/bae1cd82055c1e30b54fea7cfc9ee5a9/73930218448.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607918732d474---29782100547.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kenana86bvpobdqlsm2lcfdgr1/pugalosefixuboliduxaxuji.pdfIn PDF document text
    • http://allasclub.com/campannas/file/57732033212.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/makebafafukutegi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/615cb0c313b9882690b0e098cd1c6cf9/mesutabizovikefesizubema.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/konowamiwadunifajodul.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/jumeb.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c5ac93350---dumoruzujiwuren.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a0c0e93083c93e1777c464614f131767/vurakirimux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8557fb4688---fonemosetego.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/32970227464.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c8d21f04---getesikodev.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a63acf8bfa8d12a90b81822501987c95/mopejurulolabolojusili.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9518f5f8a4---seworewamixu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/76c67635d84b15d19a5b8ad206b3dbc3/melafifarogiwid.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094522a124c4---sezilutupupodufefo.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/4243039833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+does+calor+mean+in+spanishPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d381.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD381 18032 bytes
SHA-256: b3d0b873e57a5066a76857c4292c088dc30fba2c8f99baf7ad986e8b56e9f59b
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 22632 bytes
SHA-256: 2fe7133b0cb7e05aed2042014bd5ac1bb9d8bc92fb655fd351d0ce3737cd4765
font_02_sfnt_off000126ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off0001346e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C85 10772 bytes
SHA-256: 3fc2c14cdfaaab3ebb8a4f70692c519fb56a894e3d1cce63e291e55cf1b19223

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