Malicious PDF — malware analysis report

Static analysis result for SHA-256 a051d535a31edc3c…

MALICIOUS

PDF

101.1 KB Created: 2021-08-01 23:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76e996830d24eaf37c5b20b18ec40f46 SHA-1: 4ce8c9d775af2b0f19159db944c87a715c7f8876 SHA-256: a051d535a31edc3c35aa33b16c5f815f4431017f58de2535637c6aa7c780cb3d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs were extracted, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ural-resyrs.ru/data/file/lurav.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c92f6c24598---58122435145.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/65s1aso496kt4v7j5sc5nomkah/30272947021.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/64711199802.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/82027905137.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/9a5b9849cb9e2de61ff4b87bc6626299/4639602195.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/39027244597.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/23699534886.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t01im1ou8tlb3g7ua3n3pgkk0e/30651144789.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608848d803a50---13985222188.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788b9f3932---74615149217.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe943813d3---jurix.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a161448523e---37957785899.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/79662034543.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/36111868373.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724fb29467a---fixapuwojugir.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/vowejumisemaguvimexagudu.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/kogeji.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/9337628326.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/158c51ecfb7adca5550bdbff4d8dad1d/55934997782.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/99466501177.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c051bd30983761ed3e3e979c33ffeff6/65501097594.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/88cb30fa8f75f76ca06a86219cf57f49/41778930279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=feel+the+fear+and+do+it+anyway+susan+jeffers+amazonPDF 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_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 11084 bytes
SHA-256: 4cd3cb5c46983ef97ace145cb948647f1e522d20ca995c16bb97ed77c0fbe779
font_01_sfnt_off00013d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AE 17668 bytes
SHA-256: 8ef47c7e97e096f00f463dda294142d0a97a99f682a46ed742a730d5778865b7

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