Malicious PDF — malware analysis report

Static analysis result for SHA-256 970b531979a8cb74…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 16:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ea1648a1d5d76e1ac78e08f384794b8 SHA-1: 08bac95019793288753f7e1ee3a445e41ffae471 SHA-256: 970b531979a8cb7457c3b1a245936dd9469ff525fccb01725408cae958e8f8e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=process+management+of+operating+system+pdf PDF link annotation
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27264416357.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d8818b0d21f4dd1fbdbef966e79341e9/92782118015.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/logokavafelewajulemulev.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/a4s7ojr3ikc13agkeh2cujfjuk/lozixilevo.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/3512154988.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/33656964807.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/17631943700.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210902_031628.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/xamojaze.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/25053719628.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/35609345585.pdfIn PDF document text
    • http://asid.rw/userfiles/file/72685482.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/63158565860.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/nagudena.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/63254206161.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wonijujabewozovovavo.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/56389051428.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/samegepuzasuzemu.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/zadoburop.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/vizerulexoloriluwa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161340e29ef077---furoxuxoman.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/bazuxazulirev.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f80b9de85---40746917204.pdfIn PDF document text
    • http://fabtur.ru/upload/files/62725705849.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/54007707504.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/wexurasirajog.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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 11032 bytes
SHA-256: ae946c56f0200ed5c97d69ed3ec89023ec752bbfa32d19c1ff71672c0b9f54b0
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 17076 bytes
SHA-256: 1cbd37e8af268a0e0978ad51a93657a634486e10c6e5c5680f68e41933916de8
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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