Malicious PDF — malware analysis report

Static analysis result for SHA-256 1892b38e6652c729…

MALICIOUS

PDF

94.6 KB Created: 2021-10-04 20:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9b1df5fabe3960ced4e7e2e4050c3ecd SHA-1: 9fa5579f6ae7ca4cdf5ade44331d8cc0126ef955 SHA-256: 1892b38e6652c729700ef68d899280dd120346d09acb4444ce4b24c3aeb6bb5d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable domains, indicating a link farm designed to redirect users. The presence of 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and heuristic firings point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=citizens+bank+park+seating+map PDF link annotation
    • http://kemnhapkhau.com/upload/files/pubatadexilimagono.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/guvujosamagefavomu.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/giwebifosam.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/tinalijinulujegazajaz.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/rigoruzomiwodib.pdfIn PDF document text
    • https://vpmemorial.net/images/file/92114806232.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/wujoxurudebepegedofu.pdfIn PDF document text
    • https://efnnma.org/files/file/xelaloninim.pdfIn PDF document text
    • http://canadanur.com/resimler/files/32628738297.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/46013100508.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/zeguzorawoliko.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5bc094f8e---65833303678.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/gezikelexesose.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/95452078625.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/8545249321.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/57093851636.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/76302177785.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc40126af0---repunudatevudegimo.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/69494227047.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/givufijiraje.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910095233.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i2g3q0hfscuke98nr28tag7sh9/60025344520.pdfIn PDF document text
    • http://boldogelet.hu/media/mikivagirusomowop.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/78789002169.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_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 19660 bytes
SHA-256: c418b1b2dc4b16b5b792b9fb6d74cc4872c6325e032d4a2fee6f60a8d81f2a2a
font_01_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 10752 bytes
SHA-256: 53c2b895cd75dd3567e8ea53f3d7bf01980c0915c6841a2fb6de41b81a0d7eab
font_02_sfnt_off00015450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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