Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbca0f99b7764449…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 09:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 581a61384b7753ca1262567fe4cd69af SHA-1: 9435386c9097b027e7aea77d08978fe2ef403660 SHA-256: fbca0f99b77644493eb86937aca9a698a7ba3ac82d8ff2e387e82d3dd13df368
184 Risk Score

Malware Insights

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

The file is identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of PDF heuristics related to link farms and compromised CMS uploads, combined with a visual download button lure and a callback lure, suggests a phishing or social engineering attack. The embedded URLs point to external resources, likely for downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=play+store+tpk+zip+file+download PDF link annotation
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372149cc685---41655689861.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/bagidizaxitiw.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5323943c---2143418900.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/60305290739.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/6145676016.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/14156220348.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b313030970---pozin.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/47320350356.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/84801700821.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/93170900165.pdfIn PDF document text
    • http://skia22.ru/pic/file/roxepixejizal.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/10526833532.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d5079330---24404801888.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/lufokipowapipufit.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614301bc71818---maroxigesilomijokuvutokek.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/wajilonevezen.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/64947169229.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/tupasalugabe.pdfIn PDF document text
    • https://serka.com/serka/upload/files/rawip.pdfIn PDF document text
    • https://redac.ch/upload/50752530139.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/65497325524.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/21840940829.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/20229335641.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/kumemomugididemozizarufe.pdfIn PDF document text
    • http://totoumi.jp/upload/file/sanobuwabi.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/50920265286.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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 18004 bytes
SHA-256: 46d7d25b7b2b00ff6a7d0e825b606e15ef36577f9ad370ed3253872b113c22e8
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 10844 bytes
SHA-256: fcf30aa24cf6e703e8edca30482965e8cf160075f58f8914ec298db5f42a8790

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