Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c51416e0ba616b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 22:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 550c8e0c1746ac0aef70df0d77dcad51 SHA-1: 01fe59ea33a257b22b1b9ea23df71472e8cb845d SHA-256: 11c51416e0ba616b569e1ead8456428eb9dda3f82fb022125c0ab59347622fa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=impact+of+social+networks+in+our+daily+life+pdf PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608873be5b757---zozabuvosewoxu.pdfIn PDF document text
    • https://mszukam.pl/dat//file/jekaxisu.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/87578063493.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/dizenojuwepokefesuv.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608549d706585---jiwebizimomu.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/44862672101.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6dbc188fa---misovakasemojatepamabune.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e375f997---29132908117.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768d069e299---63249585325.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c550c460615---bututumozuzanog.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/236043c5761fce5574f9240c0e2f9512/64915619885.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9effba427---73919227723.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/62795489482.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/weruvurenosejo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b31c6584a587c113eb00f1d7666ee411/zanazegolivezuwir.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1595174605608f260697600.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d3cbd94d---texurumojenividanupuz.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/30846640362.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vavalabodabuwefemewu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3a231971c79f57ab8fe95f941c04ae0b/vamobibirewopil.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7429b7722---kitezupasupedor.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/41428376228.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607553b5d92ee---gekupo.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_off0000b7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C4 11124 bytes
SHA-256: c965651637c45c2829ed784b81fd4f7fb26dda777437a4c7b8c6b9d4cec0d2ad
font_01_sfnt_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 16332 bytes
SHA-256: 59c51d62b38481f6d3f8d3e3dc0c32b2907a58a39c4f1b73955802f23473501a
font_02_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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