Malicious PDF — malware analysis report

Static analysis result for SHA-256 885b1fb65cea40f0…

MALICIOUS

PDF

82.1 KB Created: 2021-06-30 05:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 827c10a749ef3525c5595798adce795a SHA-1: 53312587d85942715794f9d3b94379aedf4e1e5e SHA-256: 885b1fb65cea40f093847327d659b48db6688058b5a195709db1faa70eec87fc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of multiple external URIs and link farm indicators strongly suggests an intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://smidgel.ru/uplcv?utm_term=fifty+shades+of+freed+watch+free
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9670f3e3---warabejawakeliduv.pdf
    • http://garmagostaran.com/Upload/file/golumotutenidarijal.pdf
    • https://emilline.dk/ckfinder/userfiles/files/19002329790.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/dd58f2f2f7e6ad034dd62ebae5347366/vivugijake.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ebffb0de0c61be88eb143d9c8e518309/61781136520.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecd71a94b---63405687193.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/cbfb8dc8e3517270fe4dc3b233effe98/vekumexuborapodir.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/3d1b7116096174f793997df36f0ccbf3/20528668106.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/39e8fc2aa8992a3a357581c722e2d2f3/18886079133.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5a1c10f79dd2a54f31a15a3ae86d1300/44915324694.pdf
    • http://superplasticizer.cn/d/files/51867441342.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fba00e73d---vivuvikawazukusu.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9fe76db09---6750278559.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2da2fa0a46d1d3405f1c093861cb6989/25137980219.pdf
    • http://polipadel.com/userfiles/file/91370681282.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd01bc930---luvatul.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b80eac7b399---xapewinitij.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef7a8d90f785fc6bf24a4c87557d1a77/dikasofabufozejomiduditek.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609099cd5e1a1---sajofuvunapitetinesajelo.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4pd46k802heb9sv98eevd55e61/84438201726.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/omskqd8atctdpp408nisoaq38h/norarokemomavirar.pdf
    • https://pima-alarms.rs/slicice/file/44116686832.pdf
    • http://moscowprice.com/content/xuploadimages/file/guxapesagibadesufe.pdf
    • http://toanlinh.vn/upload/files/46532527059.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c538.bin
5aa0fdb6b42e6a1c5f960e2373d8d1d31c73ef0419aed111e0dc5d96502e0374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 10600 bytes
font_01_sfnt_off0000ddab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 16792 bytes
font_02_sfnt_off0000f5bc.bin
163678c258d2da1969300b75d4fe4571f7bee842ba7630469f6a03f1d74eb974		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 17460 bytes
font_03_sfnt_off00011058.bin
4f7d057c75c805e32da2d494b853736f538c1bb9616b22887ab372213fdb3baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 16356 bytes

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