Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b804d36516f342…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 20:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88b6a494a492143128161b480119b936 SHA-1: 45345a555df1667af905ee8bce017d4ae6b28fc1 SHA-256: 35b804d36516f342f0fcbfcbf0de08fb19ac83507e933fd020bfe643c4e316b3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of numerous external URIs and link farms points to a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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 http://dfanchem.com/upload/files/tibezejasifebolewekasuza.pdf In PDF document text
    • https://glamweddingdesign.com/userfiles/file/1415032550.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/3202fr1vjfdv2l4dmbcep9cf07/tuginuvofizevubor.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vopuvikawemomupukuzexe.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9279e18bdf---xuluzurek.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/gowikifitotuberadidodi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ec59b554---72651649747.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d227d5e8243d789fce1584e6bbecd7b2/mugigajawa.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/70549158680.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/gevaj.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7eacade51---52595384351.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/gajelapige.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca825955f1---salezopovema.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/95160505645.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/bqp7lb38qnogehmp8j5j7omj5p/pomevaxazigeb.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/17f69c148cc935430961ae72c6508fdf/5261790627.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082c2c7d7812---75192866455.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/88d9443b6b6537debfe045a987f70d1b/dubawikesi.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0f5dfe1aa2bce53e90e752341fbbd2da/4411108437.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/89469326706.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/15616027778.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/85584495886.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/71601974907.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610617e58a93c---febuwotetonogudazabivedef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=militant+islam+book+pdf+jansenPDF 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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 10916 bytes
SHA-256: ae4051f6ac98ce30878c49b1149e832f02632dfd37e55eff9eb3ee77f5a95683
font_01_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 16524 bytes
SHA-256: 04246549c784cad80e54d58cc912604be9541d50db00da2b8f1dd9de9c511c28
font_02_sfnt_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1