Malicious PDF — malware analysis report

Static analysis result for SHA-256 6843ce6c941d9fbf…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 01:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b337ce8ccaa5fb67ce549e7abdc561b SHA-1: ef66de433081a5964517ec38c32363947e1e9d83 SHA-256: 6843ce6c941d9fbf2b919fa3e562a771a865ce6263ca54613f2cbce9b5a10556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=watch+raised+by+wolves+online+free+123 PDF link annotation
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4ebqa5rid7tcmh8o4gr53vos51/wikazarazitidopukipa.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/aa264352f0bdf9076c5980744152c586/dizeludow.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021918519126681.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/dexekabiwo.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16145154c41709---2797757670.pdfIn PDF document text
    • http://geodez.com/pliki/file/7869760313.pdfIn PDF document text
    • http://origo.ws/userfiles/file/rivaveguxurevos.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/34268310855.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/79324864785.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc9a4813a---tudovolotamoxawap.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/12180643487.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/91646486739.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/13394849866.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/nitafupawowidoxebifutusor.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/74725460278.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mebovigusagijim.pdfIn PDF document text
    • http://methese.com/upload/files/84655152952.pdfIn PDF document text
    • http://3m18.com/images/editor/files/zetudefoliparutod.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/53588122797.pdfIn PDF document text
    • https://bawauang.com/contents/files/lizelowanozojovurepoxegop.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/kulewodivinivo.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/76444126105.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614504b0b4832---85383667248.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/80241239602.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF65 11316 bytes
SHA-256: 226aa9060d29d5ee30193e109e2456c8fd4e66e50844c24d8cc5bc29f091fedf
font_01_sfnt_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 16672 bytes
SHA-256: bef114a9422b46581e892e0ca3f160b65bd85a5d9bfa2537fa3002d971023555
font_02_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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