Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57afbdd19159591…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 15:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e6508f9f18aaccc04bc26b820fb1154 SHA-1: 8ef13450df730ec4a917edc300f1c03f30f78aa9 SHA-256: a57afbdd191595913d2c83dd9be8e5c4445dbfaa2eed9b10b74b4ef24227a25a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other potentially untrusted hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=rear+view+camera+manual+transmission PDF link annotation
    • https://mayurherbal.com/userfiles/file/xaromewikigoli.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbbc7d97e---24125274776.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/98732842025.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160fd863455796---31080537060.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/92820861230.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/39861670944.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a970236c808---dawabakesevipodiliwobunum.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/ripedovixufojal.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc70acc7475---zasusi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/fe6882373f667b4014159c2835b4d68b/murixodaxubo.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/dl2006ha0jjvpfrrr0tb22hgau/kilagupebifedilufoxilane.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/jikodidugogukusabafoli.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a616898c40c---97567625707.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc53daf5f---kazijilojejezilomekedepos.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/52daa74910f9d1d5b3b4f107c80c77b4/vurid.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/10706984782.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/watev.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/sovukeseranoramib.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/dosufogud.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/00006d104be2b255dc5194753ad3113b/jisuv.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/pedetaleruzibonaw.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/po2ktmrk442d1f5r29rnn0mnj4/pasitifejonekuzol.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/71489348848.pdfIn PDF document text
    • https://argumentua.com/i/file/sogubewuxabokajemovepewuj.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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 10688 bytes
SHA-256: 8f07d6c604af24c9944b8d1462c39014d8542ff63ece4e7274a7f7caebbdf463
font_01_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 17092 bytes
SHA-256: 124930036286fa53e4ddc1583afc42a82b71b347c70143b3095ad0ec0d79465b
font_02_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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