Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c7ca9c75139ca3…

MALICIOUS

PDF

79.1 KB Created: 2021-09-28 03:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be64e32ff911a5cd9c9df3908b0dd09a SHA-1: caf0b4657bf3fb063dd8f384dc5a58e1942e0a9c SHA-256: 93c7ca9c75139ca39bf7f474753f6fd46497396288b92d2827babbdbe58df078
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm and a callback phishing lure, suggesting the document attempts to trick users into interacting with external links or phone numbers. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://serviceservice.eu/userfiles/file/39707877547.pdf
    • https://lufty.cz/UserFiles/files/82247901937.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16152314d1debf---pivezurulujufabobuwe.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150a412a9969---9421896682.pdf
    • http://jinanxintiandi.com/userfiles/files/vanatosuboxivudazirarut.pdf
    • https://vinocastillo.hu/editor_up/5336100470.pdf
    • http://huanghels.com/filespath/files/20210919003409.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/naxavusifa.pdf
    • https://valleyrentals.com/userfiles/file/67264387568.pdf
    • https://medbillings.us/lightspeedweb1/file/22894359719.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/fuxaxajifezofunuxaxusavi.pdf
    • https://mpksieradz.pl/upload/file/75050350720.pdf
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/podofo.pdf
    • http://romengo.com/ckfinder/userfiles/files/vezupezesidezo.pdf
    • http://lustigersteirer.at/userfiles/file/wuzesivuzokawinizogirine.pdf
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/kirowigetajoratibajifaje.pdf
    • http://miskolciharsona.hu/pictures/file/48132037829.pdf
    • https://emailing-online.fr/uploads/userfiles/file/kelebomisesuluvejob.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8ca1bd492e2dcdba9145d9f45b498c8c/76646124717.pdf
    • http://irinabailey.com/upload/files/magikeme.pdf
    • http://jubangh.com/Upload/FckUpload/20210924file///19320848435.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/49377892960.pdf
    • http://otworz-biuro-podrozy.pl/userfiles/file/75305117592.pdf
    • http://immobilier-valence-agen.com/userfiles/file/96839915060.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/gamipatanelabogujegifi.pdf
    • https://www.alugutader.fr/ckfinder/userfiles/files/18709349183.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+uninstall+indus+launcher+in+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87e.bin
4e0f22cfd6e4937afa0fc27fc233a86b8970af76b798a2331472a5577227b397
pdf-font-stream PDF embedded font (sfnt) at offset 0xC87E 20160 bytes
font_01_sfnt_off0000fc79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 16792 bytes
font_02_sfnt_off00011490.bin
1ffbacc7cad4508baa50022bada21b2fdab1938bb0b99f7a6b90cc01df68cf54
pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 10644 bytes