Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e5f8d5b878ff86…

MALICIOUS

PDF

73.7 KB Created: 2021-09-09 03:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e11dd9fd997c993b82b48c0173a8f8e SHA-1: 5425b3c0aa8fbca4b514d682d1815de97fad7d2b SHA-256: b8e5f8d5b878ff8650bb1d27d572f6e07df16024d2cdf147a4f0109a9a6ffb3e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://afgventuregroup.com/cfiles/file/90680288223.pdf In PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/61235422961.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/16521706428.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/75540710580.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/zadulawalisogetosazawife.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/tarerozitemimepevom.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/guruwikezugoxiburaxogi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139532a4fe38---93696711681.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bfa460a1f---mibixiniwafoxovedu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9ae807d2ade7d5093c24180ef559646c/giwezig.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/90953556264.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/32795388022.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906071612891466389.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/55024884075.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/zogodurosaripokulaga.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/60522007313.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/zisofinizivedevu.pdfIn PDF document text
    • https://toocapen.com/files/kogabikefigoginev.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/nabuzetadewebikivoketo.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/71923448075.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/87542577953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=asphalt+8+hack+modPDF 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_off0000bd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4D 10632 bytes
SHA-256: 749548ab649418257de3baf4c3849f28153dd84240e7af5441daf8194cece84d
font_01_sfnt_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 16840 bytes
SHA-256: b467b3ac81ebb871c8593d862afa2931e1107b36b93ade1f4bbeb818fe2e95ac
font_02_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1