Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c488d63e2fe6465…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 05:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42b8a083eb31b3ac59e42e88f21bdb41 SHA-1: a2c56ce27d44b2a3d416a465e675820feeb60670 SHA-256: 3c488d63e2fe6465421c8eb2f632c9801429fd09e0299e5ce21fe22629cbe0f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://hoangphatdanang.com/uploads/image/files/57850310758.pdf In PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/55627937603.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/sumudeditiw.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/69d5473dbb82c6ff6b4df13cb2c52986/dugodosofelarigotezorij.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcf7a2550---jigarizazulixup.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6206c9dd7---xisoronadofilifobo.pdfIn PDF document text
    • http://airsoft1.ro/files/file/19141452117.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/vaperat.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60800a28c9---96569009309.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/92998596355.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/85650602322.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/64730200823.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/05a904ce8222b31ffefac1f2c63360be/dugesuwupamejexulekareji.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/vofenujurilelivaxa.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a436854b71d---xuvuniputisuje.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aec9d074869---17503274570.pdfIn PDF document text
    • http://klefmarken.se/upload/file/44462277363.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/9670984617.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160756e83adc46---70054587513.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/14038906189.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/16523627268.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6518e6760fc05e6e749b188569adea73/72349615942.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f1b2df39710e6d7ca593da514a7bce10/wekifutarizude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cambridge+intellectual+history+of+byzantium+pdfPDF 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_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 11512 bytes
SHA-256: f8414649157ec50c8889ff782b0dce92d30c2528bf7a26754c65a1b635108fa8
font_02_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 19380 bytes
SHA-256: b1aecd120c5d209ea9a375876ebc617a6b468d050510b7dab31aed60afb59d46

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