Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ff3b4861319504…

MALICIOUS

PDF

79.4 KB Created: 2021-07-21 13:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7c1eba118624e162d6904499856778e4 SHA-1: 315c3b222c36df3ad1384ddb07b54c91444f5278 SHA-256: b8ff3b48613195049790a06b46ba90f875dfea5b17dd3dbc90cbecb9ec6cd85a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://iworking.vn/uploads/files/matisawafop.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/zozadixajakefowusobovasi.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/jomove.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/64039476288.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/552448da3d311c9cb717c55c1b7cc0e9/domibituwavuvikusebavalo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5d475fd2ce1d400d11a5d61d0f894b73/62892084525.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/94418220241.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5715ed04---zugufivar.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2415d5dda8---vojotudozorobewuko.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/o5rm4fb6vs6d3l36t04jh8egrj/25497412405.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qaofrfmpag42mv4b0o80ec38n7/pixuzarutajuzukawofa.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d5af1955bed---48647238150.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/3p67cj31k39agigs97c8skcrn6/31873930638.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/soxatopuxafozemug.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2935b993c0b29060a488b41ec41134a7/55436631305.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/645eb9e0dbea6dab8a8efd13442a1a95/sabeledexokuwepamop.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4508f3b819---xosasizukubik.pdfIn PDF document text
    • http://vhshf.de/File/46900890987.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6542ea35c9---zopagizasej.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/kower.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/suwuparisipixabirugorow.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/6970752803.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608094c1ee305---94327070166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=stocks+with+most+gains+todayPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 10904 bytes
SHA-256: 565c1bc03d5e2f3b1351049a080b752f9c4cb7bb9b23cd4a54532c687c7c6367
font_02_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 17560 bytes
SHA-256: 3d21e61113b323fea3feebff0a821ade74aea99c2ff14a422fbd55119f25a4a7

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