Malicious PDF — malware analysis report

Static analysis result for SHA-256 122d62ab72a05ce8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 10:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d87845461d9782779ed70f457504f7ec SHA-1: 4c95182ea7abebc8376a9de7259a202ce876fb14 SHA-256: 122d62ab72a05ce8dd8e6945a095a93ac54fa95788620dab801b70300265e833
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by acting as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=descargar+alien+quarantine+para+android PDF link annotation
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16145e603cfff2---wujufetodakiguru.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161402409549d3---61088257479.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091302175473499.pdfIn PDF document text
    • http://fteq.ru/files/file/pojamekulijumafipeziva.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/wepolidagiji.pdfIn PDF document text
    • http://cssh.es/img/file/nolelawigub.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/fukas.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hpigv6dr873ig1jb80ip3q4r72/99840709130.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/medizugogemo.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/weruzorafumed.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/tajabugaxunowinojedegedup.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hj3g1ju5jhi814vgv2q4h1m17n/kijunagusirejawiboru.pdfIn PDF document text
    • http://venkateshservices.com/uploads/felotuduzowowiwoxipi.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/pedewoladopijaz.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/sokofazotekadixefo.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/45509625859.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/zuwolixabepoleforumubi.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/jazoxedov.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/98f3276719a640ac48b7cc612e4452be/33269003548.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/19357185569.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/zofumutedaxodorivo.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/96512545427.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/gojusupadiwo.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/87844655938.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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 10936 bytes
SHA-256: bbebffa74e970c0fd80625344a788735a29d6da44ce7d69e7de40576eafa99b3
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 19292 bytes
SHA-256: a62cc2ffb2cdb952969e09e5c00277c8842441736cd585ebc14b815c97c15dbb
font_02_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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