Malicious PDF — malware analysis report

Static analysis result for SHA-256 df835931994a018f…

MALICIOUS

PDF

74.2 KB Created: 2021-09-24 20:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 11c0473e6a8da8d7da32fe4d1d97e995 SHA-1: 623ce013e8a9ff40cfdf9871c4d56fbcdb450c76 SHA-256: df835931994a018f93d56f502bea89aa68073dd60e471d5224633c99f81359a7
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The presence of multiple external URIs and compromised CMS upload links points towards an attempt to leverage these sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=3d+woofer+led+tv+price+in+pakistan PDF link annotation
    • https://srsatta.com/ckfinder/userfiles/files/xevivabil.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8bbeb93c29fdeb399ccc2f75a0afbc97/foledafudemifopifomude.pdfIn PDF document text
    • http://geodez.com/pliki/file/xisanidazifetaj.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/ropawufasurusotovuwovito.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/budogepotoxoxe.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/bafexotuxaxuzipe.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/203e690b3ebe0ace72cadaa8ce9f79e2/bobunapivovedafasutoto.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/65299555595.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f86988b14494c5614d76aa8d891e2465/vejofasezilitip.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kozujenokomej.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/8649554293.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9031eaf4---miboposexenife.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/ranab.pdfIn PDF document text
    • https://guijek.com/userfiles/file/woras.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/lukegodanemixesusufe.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/18199248414.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/kuziniginewevawagoj.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kuxed.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/dotuzekelidamafoxokubuk.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/zilukebibafasisitejuvul.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/65936658031.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/dijojifebilefotozolexuj.pdfIn PDF document text
    • 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_off0000ba0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0D 17704 bytes
SHA-256: 841353bcffd36d210e8474874c0aaedc73955bdd5ec063b29bf2134e70978712
font_01_sfnt_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 10932 bytes
SHA-256: 787572d8843c4760f1c532bcbe6b1f841be46f1f921ee19a807256da7b410272
font_02_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1