Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5376cca0fd6a70a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 03:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd38207f5ce4fd7d92fd8bce40f47792 SHA-1: 0fbebcbfa2a0ba0e36fd5c22de011bde68c3220d SHA-256: f5376cca0fd6a70a30d5ed5581fec3b9ab3dfced75861d943cd8b7987f13a05e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The file's purpose appears to be directing users to malicious or compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chistogood.ru/admin/ckfinder/userfiles/files/wajapewexulefegudir.pdf In PDF document text
    • https://zemiigori.com/uploads/file/48099726392.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/27602730799.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/32296886173.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/fefigipinow.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610db8ea1ed07---janisoturodemurumanuf.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/jizupigonuze.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b3b3af8d5---52944660680.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd7f043b80---94548574766.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/wegizivexido.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161202e465e291---jemalikipoginowibevagom.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/32giniictiu1h6p1v2sc5g2a24/mewuwevimozisigabegediles.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/85106025921.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/rifolofe.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/xevubatukuvavut.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/soloma.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/62oa0449hui9ddghrhgsepj71a/lulutijatojuli.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/wuromev.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc321206286---buberavopurumagelolibi.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/wexaxisizaxeregazapebos.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/3749b16118a9e4486bce5a14d5165528/4606352221.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff22269d1---suleraxijitabisinul.pdfIn PDF document text
    • http://indemo.pl/Image/files/tirevigumegipenaguxegeze.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ebb3fbd9---88037807913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=declaration+of+helsinki+2016+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_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 11272 bytes
SHA-256: a8ccbf83ec84eef7a0cd369952ea5fd0e83695508ca44a24dd540fc28299b92a
font_02_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 18368 bytes
SHA-256: 3b8d79a01f555f4d8ca39361c06bbb2bc5a2e197bdb970c5c7cb5aa5d3560073

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