Malicious PDF — malware analysis report

Static analysis result for SHA-256 010e3dc50fa5b897…

MALICIOUS

PDF

79.9 KB Created: 2021-08-01 01:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 73f2d1e117176ae82e4a952c2a4e8fc2 SHA-1: 5da6208bdcf4504ac95156d54744d4100c4a51b9 SHA-256: 010e3dc50fa5b897f1dd42d206dca68be73fa4d59b2e6c03b24e9858e656ef7a
196 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 websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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 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.
  • 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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705cebb58fd---55735520723.pdf In PDF document text
    • http://dambi.pl/userfiles/file/90113623655.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/76356691557.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/42a203a7221b6b76949c90ca4fbc2a8b/88518376364.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/31107423703.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/1c82215bdcf21e3b342b1beb9252de7f/71693430255.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2359fb83e8---57485211519.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27e82bcc0---62095866324.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/26776063284.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/nerixitugutumikazozibive.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/simagugoxoxanagonapegizek.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/velobuvafixozufanepip.pdfIn PDF document text
    • https://guijek.com/userfiles/file/48691507405.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/xalalaximam.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd63c5dccd---lanegijedoledipetul.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/72122886572.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/885cc88a836b1b67a428e10b6ca90b77/jenako.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097aa091d1ee---59492021492.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01292a902---vanoriwoziditixob.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/40851692837.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/76930678912.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ec54b958---regutejosawokamekor.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719091dd217---dakeguf.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/47615159898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=clash+of+lights+s2+update+apk+download+85+mbPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 11756 bytes
SHA-256: d20df627efa57b6ced8540bb08ccc591a7ac793976a2bcf7aea7149431611bb9
font_02_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 16128 bytes
SHA-256: c944d711d2c6da0682d8fe73005734c2a4ac386a113a97350710a77a359c6f4d
font_03_sfnt_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 1928 bytes
SHA-256: 82dec79e985f7d47beac3fb7780cd477958dcbbb3605eaf3d3a52cb129c80e9f

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