Malicious PDF — malware analysis report

Static analysis result for SHA-256 3350b22fcdc4a0ce…

MALICIOUS

PDF

96.5 KB Created: 2021-07-15 11:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d05799f7a219de015ed58c8f53922c64 SHA-1: 96f7e3f53bb95af7af8b9bf00ac832b74e797e68 SHA-256: 3350b22fcdc4a0ceb7d3ef815d4d6708f1ac4e074a3fca6ca9bd4d8187fd4a2d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e7iu9eoqhur5ikpc28bels2th2/70142248355.pdf In PDF document text
    • https://bio86.net/fichiers/demikosisuzetapeviz.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/49d9f16dbce05935e07011f8c55f1fc1/71964229903.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/wowunifanokim.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/36375085131.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/fuvikubi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160798c3de1173---43959309945.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/18990569690.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb85f8c91f8---8209430968.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/264e85d9c241e6bc1c3d6bca09b9226b/dibasude.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088295dba632---dubulufufukogifibodefaxu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/856245fae0d05c86da7381ba67ba2104/gafuluwijotomezumodujuzi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/4fv1nqlec8tkoqso55uhnj1do2/gativegufi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/85de80849061ae99d1044c83ee91fe67/8760089142.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f965f7deab---64551555469.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/76841597741.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49956db3a---bidorexubedenotisuw.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/25090852549.pdfIn PDF document text
    • http://fitviewer.de/files/file/39437044373.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/91296828410.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/1d9b3a7331d20dace5b236b5b2f36e0c/vonokefiwivune.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0354db3af0827b61e7c7fd1cac640af7/51253929883.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/kogob.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03fa47dd1---resed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sow+past+tense+and+past+participlePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16644 bytes
SHA-256: 5f215d8a49b83be3cc9f5b2b0c936aa9c360a1dcc870f62f94669a5351ae6fcc
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 3444 bytes
SHA-256: 73bd73c0e925edba69ccccd58e8e4767e3fbc694d065c43985d707bf27b66945
font_03_sfnt_off000127d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 20708 bytes
SHA-256: e7f9fd2ebb384ba230eec1101b0b6953bd4003a9be9db08a8fc389d69256cd0a
font_04_sfnt_off00015b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3A 10668 bytes
SHA-256: d7466d543841609c7d24d81cc2a7b9d8f5c78f917715704b6d2f65cde7009101

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