Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cab516fd313970…

MALICIOUS

PDF

88.9 KB Created: 2021-09-02 00:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67f179474cf66e79ce46a1ec141d2e54 SHA-1: 2340562c1d6579e8868ae1ba556dc5b0c8ebbc77 SHA-256: 23cab516fd3139708c4a6fed52bea9d15ea28080ff2bf5bed088c31afecfa427
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest it functions as a lure for further malicious activity, potentially involving a second-stage download or direct social engineering via phone. The document's structure and embedded URLs point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=working+of+two+stage+rc+coupled+amplifier PDF link annotation
    • http://bsa-billiard.by/images_from_html_editor/file/7616927050.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/48938263932.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/93935367497.pdfIn PDF document text
    • https://krossi.ru/images/content/files/60295101503.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/sulelov.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/sinebepewu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e129065a00---romatumuwabamas.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/76967482019.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38b71c1b7---23008047803.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/37930568142.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/4709939313.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30ac19fb0---rabifapakebiwonuxu.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/24984797188.pdfIn PDF document text
    • https://saam.vn/images/content/file/nexebuzotebi.pdfIn PDF document text
    • http://healthywithhart.com/res/file/81857758367.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98530d62b---88767330371.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16088c143d164d---19683794731.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/mebusexewinuwejokifoges.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/24270478028.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/pezuvubovozumeronulut.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13eec27748---fozonusejupo.pdfIn PDF document text
    • https://masihpt2.com/contents//files/modozuzuzizixizinetatik.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/vasupezizakapev.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_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 11232 bytes
SHA-256: 58d77fbdab3eb34ccd6aa44729231433390517bfb5cee92d8383dca939bcf945
font_02_sfnt_off00012894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12894 17012 bytes
SHA-256: d159e82d5468530f30b5aa672986506690269e60d4cf7a992fe790151b42b8b2

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