Malicious PDF — malware analysis report

Static analysis result for SHA-256 a628debd641f0ed8…

MALICIOUS

PDF

93.9 KB Created: 2021-09-10 19:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96285c2b4b8cdc4b3569da4695042412 SHA-1: 88220d71c0c27919d2f82d9f1a029f7e66338983 SHA-256: a628debd641f0ed8408b0be9ebc9039bd44ea509e03fcb09787574402cb2c7b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded within the PDF, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating attempts to leverage compromised websites for hosting malicious content or redirecting users. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=android+apps+von+sd+karte+installieren PDF link annotation
    • http://fusiongrup.ro/userfiles/file/6418424083.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/55977655376.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/niwid.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/felekifurapesebubini.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/fozabodafuga.pdfIn PDF document text
    • http://rld-carbon.com/file/sosabodiz.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/zefivomaxijavewim.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210905_3C764734D1E8818A.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5b44e196---tanirabunisigidowob.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/filabugojiripuguwus.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/43882189915.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/lexikunupisavakam.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/47660307915.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/kiragopuxetasaziki.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/tizekonolenotefanimimidi.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/49359543245.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45859330092.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/90692939682.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/mafukote.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1a83c65f94d1af6432e2ebeed98e48b5/65731704858.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/19ee74b9fc1865bcf8f8cb4ebc3ce950/kutopafavesukuvenawupeg.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/61747534948.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/59v2chstlmppjlgfekl48t37d5/82691902525.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-7/20210907140856172797.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_off000102d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 21524 bytes
SHA-256: 2043714d47d343473ffc8358b5ac191c268e8776e4fd8b805c2973707820f5f5
font_01_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 10524 bytes
SHA-256: e802ca018d18a05f1edcc8382bd6905d42166524e81213c914b4fbad59d0d709
font_02_sfnt_off00015070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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