Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f571806f8f76652…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 00:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1d542cf4ed19a2390b93dfcc4397c16 SHA-1: bec0fcd0c5449030c54901682be42d913cb106f7 SHA-256: 2f571806f8f766520554130155be3b6a055526e0e6410b4eef1d578624b25c94
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous URLs hosted on compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of 'cmd' tokens in the document text suggests potential attempts to execute commands, although no specific script was extracted to confirm this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ketchas.ru/uplcv?utm_term=operations+with+polynomials+worksheet
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c3672236aa38323820c288e86eab8048/vafajig.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/lvvb68sqi09vb78f7us3r2qa75/rajatavofasekowukirekoja.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0f1371472---lugikuj.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/80dfd39d047913222a9b5b5a98f89d57/85382306581.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d3b50bfe73ac296a4b0d35fb2b1b198f/47486349794.pdf
    • http://candientushinko.com/images/file/59034075061.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d03caa7dce---sulugereju.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/713764df528e0b4e59c955a22ef1fe41/warawaxalebuduvazowibes.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/for171c54o1qtkkde8qtdi056cufnfmf/nonozipoxinabibovumuk.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c0055d6d222997ee49d1addb85b3fb21/falivula.pdf
    • https://theelementrama9.com/userfiles/files/89538390312.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/fv62avgfeh53cmd5ab5d4rrlcp/1429350181.pdf
    • http://hy-concrete.ru/d/files/38568798509.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1f346ed2---59170614601.pdf
    • https://iwnta.com/userfiles/file/jewem.pdf
    • http://thietbixanh.net/uploads/files/gasapikujamokibabejimale.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e8c3b7e3a---dodikul.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608a125670a72---pikevejejobukime.pdf
    • http://ankamet.com/userfiles/file/34923578540.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc80c02633a---69106000431.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa14285f53---52846782364.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/uvkd587038ekjh0t6mvvik64q7/2424792942.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbfc11c698---jawilogev.pdf
    • https://argumentua.com/i/file/zenejasifozo.pdf
    • http://cnex.cc/images/blog//file/7943973176.pdf
    • http://nfc-lampang.com/user_img/files/87107823081.pdf
    • http://hy-concrete.ru/d/files/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faa7.bin
c23c6344421377fac29c9958d20027afa15b21153aa52c5127592f2899c77c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 10836 bytes
font_01_sfnt_off0001138b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 16792 bytes
font_02_sfnt_off00012b9d.bin
6b4ce1dfad4f76679adb9737c0fbf11dfc65c2fcba2b20940dffc8b64f5afb5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 16960 bytes

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