Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab206644e516da4d…

MALICIOUS

PDF

87.4 KB Created: 2021-08-05 09:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e24cf4bfed821eacff9c57e8583551a SHA-1: d52c04d2295bb3d8ac93b22274a698b77fb8cb37 SHA-256: ab206644e516da4d409eb9f2e2a2472509078434880a34102b67b33670de6371
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload storage and other domains, indicating it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a phishing and potential malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fioredda.com/userfiles/files/22954664077.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/50981426392.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zisopu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8lqbvms7mh7l85fo1rld9ep7l0/borodawefizefonefodu.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/26897108628.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/52135663451.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/wopasopozevugotel.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/zixodibibep.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/52150238239.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/105a4f55e761dd5e76b227b66569485b/bimisiranapufaterosamupa.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ds6p53brlv9i10kv2h12d63jt4/lolilupedosa.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/worimuwuperavubulinerawav.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/tirugubakuwukivu.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/ximupakasu.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1dcdd8965f1a87208b367ecb803d10d/73759831882.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/70220524835.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/cad540d88ee1a93ed20117a9fc91d716/4770119707.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/c4f1c842cf97cd715ec896dcacbcd1ed/kozagigoxebomenujakedadiz.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/40759869801.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f92f72882f3---xorisavavofo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kt68uns3c0ib0e6sd669p111n5/19160000555.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/riwekezeg.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/eb29d029b88b7c37d447a5d8f212792f/duzojofozotade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+write+a+letter+for+salary+increasePDF 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_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 10520 bytes
SHA-256: 7b1f3dc3ce2fcfd73591a1417b300daaa58af82e4c9087e609e49859ef9ac481
font_02_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 16732 bytes
SHA-256: 9c0f7b22f09d76e96f28b494222ed0915a356212893b316bc28576e7bc6398b7

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