Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bf9fb4643b3171…

MALICIOUS

PDF

90.8 KB Created: 2021-07-15 13:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ecba7b5a862b1b1c2cb43c27cbbe2d56 SHA-1: ae3c9edab4164082867c0b7b314bd88ad820c7ca SHA-256: 47bf9fb4643b31714151349fb265ef5fd3b3f9f161880b96f3349bf2e358aeb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm its purpose as a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://faw-asia.com/image/upload/files/3727398374.pdf In PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d05c97f6---68898411475.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f8d0adacf4af34e25877e01964d8e780/56859739777.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/varogolefogetigo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7102b60cc7---57633537578.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/20240361545.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/bedejufoluvewogolik.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/favibozenefinijowomeli.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/jugarexosumukajabozozetej.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/togajexuteresan.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4c120e4e6---vevetefa.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/74493860139.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/97199940552.pdfIn PDF document text
    • https://subarini.ro/mm/file/18292425544.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcbed79d7---remikizobivofevepeb.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3l0rf9fju9fluj6hvaa5um9eo5/jijaze.pdfIn PDF document text
    • https://birudongker.com/contents//files/13265968102.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/7547310492.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/95100899485.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/51612513557.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16085453de897b---budesaw.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/40085f4f0c950818f6219980e36135ef/70130848442.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/43474052541.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c34b7679---junutonugilezab.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/ziligarare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=calculating+reaction+free+energy+under+nonstandard+conditionsPDF 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_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 17112 bytes
SHA-256: ea40e45283bd6ec200a2f57159ad19fd13dd535c50c70a39073c66634922a16e
font_02_sfnt_off00014417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14417 10896 bytes
SHA-256: 7eb032cbedefd00764809faf0000d0c1ed19e88223649b071a1312a237ce6d86

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