Malicious PDF — malware analysis report

Static analysis result for SHA-256 603f2108f55f8511…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 16:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d7690defe8f96ae8335e56915d839d1 SHA-1: e6ef6300a10d6a98c7d6c63ac6075703873c6387 SHA-256: 603f2108f55f8511ce7076d0b03459ceb9ef8f125b534ce6a5bf16c142a2dce6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=infernal+devices+pdf+free+download PDF link annotation
    • http://hotelpenza58.ru/ckfinder/userfiles/files/vigolaribirufajozulelo.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/47195299839.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/dajeweta.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/gusoremigabalisit.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/xinaruvogegudomebefurez.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6c23fd7c516b36633a257267e16a8d81/13557495301.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/de592b343633dc27e93c62972c1ed555/95569537747.pdfIn PDF document text
    • https://tuinvandecruys.be/file/sivafiw.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/15045944616.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/zesavotowukutopatunal.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/dewovomajedibokubarojez.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f750ef7793962b145d7de51f30e326fe/16632566183.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/xenoniwukivaruki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139133a351af---61992678231.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/wixodelak.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/gixuvubeperijopusagare.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/46708192518.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/78866807203.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/nanugegup.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/16244876577.pdfIn PDF document text
    • http://aurora-c.jp/files/files/26246636280.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613395352e132---33314957900.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/kadedalekogezavinagam.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_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 16972 bytes
SHA-256: 87f63c8ab9724ec41966ba75ff5e321a2a643b6d61fea156653bd65e78881392
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 10616 bytes
SHA-256: a1cb2998b858ae8a68086d198d736bf2edb7aa8882356740a328e0d34e2c6021
font_02_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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