Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a788fb0e8b9700…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 18:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34af49bc6103643f8376f2818eb6d43f SHA-1: 13b19691269769d24719c874fbbb44383c871424 SHA-256: a7a788fb0e8b97000241821b705e0ced9ee26be10c05b6986918967bfa0036b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple links to WordPress upload directories further supports the compromised site aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://webcertain.net/contentupload/fckeditorUploads/organization_/file/35066705590.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3efa6383f---8000531877.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/83781677182.pdfIn PDF document text
    • http://vce34.ru/attachments/file/4258725596.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1313e6eea3a09f6dd44cbe07a2f93f96/57108203554.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5baeced7---15085074957.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/pawujexukudawetutiloson.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/8255982200.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c0c1250ed---5343783524.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/g8p1nki50pmphup3ba2nsi6j6n/45448937785.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/suzevuxopujamepavi.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/79947152286.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o0ci02r63r06fr0ius0l4k06ko/fipakesesefejexugez.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d29c69ae31---kividofodanolokemovuz.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/limokejuwilikaxi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/4onmsj60j2t4ufnrgl8hjedk10/19517303513.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/julufite.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/tpnknkrt1qr2grlfvqclccub4r/70734338238.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce94852fff---jiwasunipagew.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/90336022234.pdfIn PDF document text
    • http://poultech.net/d/files/parem.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca34bef982---47559800851.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/79825801257.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e93592a91c1---nebif.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/90601758617.pdfIn PDF document text
    • http://epmachine.ru/d/files/vedifolaresafudefasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dangerous+prayers+against+enemies+pdfPDF 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_off0000be9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9D 11012 bytes
SHA-256: bb5579cee14d9a60b184a9716c943cbffef0b7dc14a4746990ead5f2693761fb
font_01_sfnt_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 16580 bytes
SHA-256: 896d90d1b7897524202a23688a35ab292aff4249d93e539af5ffd720d4f1dba6