Malicious PDF — malware analysis report

Static analysis result for SHA-256 f037e546f30b6b04…

MALICIOUS

PDF

85.1 KB Created: 2021-09-24 21:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6944b95ecd8dd586a7bdf41dc27e8416 SHA-1: 1a7adec011c3d7126920821fb3ae12b0033b6ddc SHA-256: f037e546f30b6b04b41f211d70b0a1c0440a7804f258d2e88e38091d850f2c55
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this. The PDF structure itself appears to be a lure, with the primary function being to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://garglob.ru/uplcv?utm_term=ice+lake+green+pop+4 PDF link annotation
    • https://kebecelectrique.com/upload/editor/file/15670707649.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/litep.pdfIn PDF document text
    • http://tochalco.com/uploads/files/63470065491.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/78575676812.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/jabitarefijatosufunaje.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/91555752812.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109030357458963.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/lopanosuw.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/vixuwo.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210923145623_1840080087.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/94528659227.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/95133583677.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141dafa74540---bewuretupuxiwarukodiwe.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/93511457042.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1f1374e1---tovonore.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/70622078133.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/19710197385.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b4123e4f---5554063288.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/poretiwaj.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/watiwofudevakapez.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/zepadupixebarilobepag.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/xogulejakupubo.pdfIn PDF document text
    • http://zerosquareonline.com/file/japedirivukulenijakireg.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/27219046341.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/36880811653.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DA 10312 bytes
SHA-256: 13ddfe03a0eb16fdc9b9bdfc684fa7d0283c8ab507b1a266f5805f31f2884f19
font_01_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 24996 bytes
SHA-256: 9c863bbf90e2e152d726e31ccada9395c5f24d65b35f9a166b8d397232e33f91
font_03_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 16260 bytes
SHA-256: dffc54598048269ffe01bdc5189362a09bafc67ea83ef8069f523f83f59aec86

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