Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abe11164256a95d…

MALICIOUS

PDF

80.7 KB Created: 2021-07-29 10:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f895a8c5f0024fc0d4623aba4860a01b SHA-1: a6619ead5d69a1a530b747cf281055bab1ff5536 SHA-256: 1abe11164256a95dded35d20d3013cabdb4d3cd52d2edc48346b9fc2bf009c3f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://peintures-descours.fr/fichier/files/kogunarufuzuwelomiboji.pdf In PDF document text
    • http://fonnepal.org/userfiles/file/pojusefiralinunek.pdfIn PDF document text
    • http://standardamulet.com/files/files/20902534016.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/jolut.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/buxado.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/vojisuxifexelolawi.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/73230611395.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/33f40f6a0f4599905502541f334b9156/3244885926.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/dugijiguzanasirodexid.pdfIn PDF document text
    • https://flomogroup.com/upload/files/razadurigipawe.pdfIn PDF document text
    • https://maisonforville.be/documents/file/49047267588.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/turopabibinufimexawovi.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210703212453.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb576d640---4406392875.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/7566260750.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097c074d8436---40644389498.pdfIn PDF document text
    • https://hirurgija.me//files/wegubovefobaxujexiwojo.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/54728077059.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/i2ndq9crfg7hdm6t434s63fc75/panazufemevixiten.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106140935428730.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ccfbe61b9742c05fc6ed201d5b452a36/xitigatawasazifemaxegej.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/70015189836.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f2c22275a---badojef.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/gorijelibiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+reset+your+voicemail+pinPDF 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_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16068 bytes
SHA-256: 4fe5f4d561b5dfb0639d650c9c049ebcc046c8a85bb41ee3f3ec2b2bbe0edbde
font_01_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 11032 bytes
SHA-256: c4b991f541ecc2ddf5446028ea4c0550e3f9871a3dc156cbf1764cacfdd9531c