Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca99dc7aaf08e5eb…

MALICIOUS

PDF

94.7 KB Created: 2021-08-04 19:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b808f46cccd2c4640f244358d7dff3b1 SHA-1: 7148f071bf5ffae5e94a3de4564b4a22a4f144a8 SHA-256: ca99dc7aaf08e5ebcfaf9ff2b0ae04609ba8a455bcc1bdc9d5e0c26628baf7d3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba668a04ed1---pupekokajikavigogijuw.pdf In PDF document text
    • http://mobilesamara.com/img/files/file/defigagikikup.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5c4daac2f459390ab0d205f9ea4b863e/jenoturo.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/jdgv9v9acrihtk2uo8ac08msh6/18383913696.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7vphqpg36bs0pjl906obmats86/80832592019.pdfIn PDF document text
    • https://moolans.com/uploads/files/34852621908.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/74321866909.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8166012241---pevijulozidejoxaketozuv.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/watatajanolilodigezal.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/66640086388.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vunepuxug.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/caa3c321d3bd6508c14dc58ce9ef9b22/85074880926.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/43395011637.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ihbhgp42ioigu7tfcfrhnn6fm2/nadatexavabexekuju.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mc2ncdga6evckhcnuvh43fk5r3/2991047959.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/tijeboki.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a2806fd53---19014405028.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/92dada15258cde154ff0877bfa4739bf/xumuwumebibebabubefi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d2876b9769477d74bf164c0937a39ba8/lifekowidefifixin.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a4e96e111d41252e7c53678208e45f27/44502164444.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/91374436289.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/40311691823.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/97706042373.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/felelagadusot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=garmin+striker+4+user+manualPDF 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_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 17672 bytes
SHA-256: 9885fa5bb001336931784dc2296e92e04f3e691cc0b8c9ef2c41af0d25736fb8
font_01_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F3 10456 bytes
SHA-256: feb40f970be0d6d57d1c92bf80ef92f4f2cedac8359fcb6d5d1df6b94adab7bd

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