Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fc417f974ff648…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 08:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bf4dc58283d44cf2b283028908fba1a SHA-1: 4c7cfc5303783b8c5dbac40eee4a3ae78d6f423a SHA-256: c7fc417f974ff6485853278aed6c25df33e6cf1cfb5207d51b94ef44b1a83b2e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The PDF structure and embedded URLs suggest it is designed to lure users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://baovephuongtroi.com/vietkiendo/upload/file/59048240159.pdf In PDF document text
    • http://eastcity.hu/ufiles/file/75815910276.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/jawimunivop.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/12079535067.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/bevugig.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f34912483---xalikozit.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1625809839sifixegosutegojo.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160749a77662aa---13182669853.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/70529031827.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084d95a8350f---wijugitofaxil.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/fevuxixetiribobonu.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tusebe.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/kagiboroviwizeresaze.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/o4494u35a04ckm64v1i8cvs782/gajegofifibis.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/19092358378.pdfIn PDF document text
    • https://ksboutlet.com/file/files/fajoviwoxomunodo.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/92396277265.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/bimufiwub.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb805d27a97---56465289362.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/c3foph1osndks3sp0r24h9vfb5/74581878889.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/20128248873.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7ae68d4b531e0c6bf9e0eae9f01261b3/16663486250.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ei7t6qe3asljnq52gjq8bc0se8/wanelesuditidodus.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/74341204176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=walden+ormanda+ya%C5%9Fam+pdfPDF 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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 18364 bytes
SHA-256: 76b9d4865423fcd993af25f810709cb55dd92441423ffd42c70c3613757f0e96
font_02_sfnt_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 10648 bytes
SHA-256: c909b8288c87059d886e8cb1ef1ab857366ecbb97a88722da005b50faac02b57

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