Malicious PDF — malware analysis report

Static analysis result for SHA-256 518a189e6e4411a4…

MALICIOUS

PDF

77.8 KB Created: 2021-06-30 23:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28fa19d45fcf737ea31eb280a66e30ab SHA-1: 425b5920189a45aa28e4eb248a8af14632302aba SHA-256: 518a189e6e4411a497044ae680920565ee952d4a640e14ee5a11176146e6fb33
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to redirect users to malicious content or to manipulate search engine rankings. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed for potentially harmful purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16085760eb5047---javeroraguxosu.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ca2d679ee---29074414138.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kodejimosivujuvanir.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/43a447a6f88d2cf7bb7caf688398038a/netitinag.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf72ad2d659---wunoxugakun.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6t9fa9362g2cut8cqoas6s4565/30022201151.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d71839699fc894bfe18ff8a5ee838882/58412537501.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac2da57e0f---11245945525.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/28757651105.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/44722469385.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e3f39120ffb14289d31930684a2ccb48/62035662046.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/181d1e78e2fe066354b642fcee308351/lokesezazukoti.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0242d19c0---dovozekowekodag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fdef2acc0---17609513580.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/mapimupavemijuso.pdfIn PDF document text
    • http://usmleworkout.com/files/file/lemuzegewumimabaz.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a456a3f24f---xobupedelowodobaxuwuxe.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784fbacf60d---12238710006.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/delori.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/92220d40188b9e2e41de862d08f67f8b/xobuxibulurul.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/951ae8b2fbc9d12afe64889760146598/79879897516.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075148a9aed7---44604043903.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609542ef18446---besog.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/jidupisowoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=isobuster+4.5+serial+keyPDF 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_off0000c9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 10672 bytes
SHA-256: 809208408895aaca4134f6c7e6358bb0769bd90da0a43b94883310df8b744dd4
font_02_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 17532 bytes
SHA-256: 384e3455f4abcfed7bad0849bec233505ddee10fba6d83732074f9175eeba1c3