Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e8a821fc6c718b…

MALICIOUS

PDF

101.6 KB Created: 2021-07-03 09:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d8c2a35847b8536feda4d2c1404ca644 SHA-1: f064cde67cc8ce4a3eee2c2c36e756171c937f05 SHA-256: 37e8a821fc6c718b4e9d27172a90a7ff0be3a1f3cd30256950e55f621ce6ab85
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://drafthe.ru/uplcv?utm_term=beside+me+meaning PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46e6e5c7d0---bijizew.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9b6edda8---51079153170.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d0db279ee3e41878059d5e212aab7df1/90729470364.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nolusoreborefaderisu.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jirogofexeladoxox.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/25596803375.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/maradomizaxanivenemasin.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/05546a3736e77089b81e31c5acf4f2fc/mememifikopiwa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b88235bf80---dejibanufosavuvodupu.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210607_1377774D81B90B9C.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7ead1e03---53438367171.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/29694076100.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a4d9d91da6a52b74ac20492ea4c220a4/12860617351.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210508172010.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1eb397223---jibunogobe.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f961ee9bb9---41527722563.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/32c3cbd8d272fae71ace9bfe46e3f9fa/91215996684.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609760f2e3594---22921837942.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/jesimibubu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609840c373393---56873989322.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090547c04755---pugidedarutimuzefamema.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/93938920214.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f517.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF517 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 10280 bytes
SHA-256: 1994fac178c59ec2752a2923bb0780b675bac076442dcc14507912d2821db891
font_03_sfnt_off000141ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AC 23480 bytes
SHA-256: b1ffac9066dfa327d9b114f9a1b41d8fa73c8d37979ddf74c1572ac7d4aa7a65
font_04_sfnt_off00017b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B89 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

Open this report in the interactive analyzer, or submit your own file for analysis.