Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79408900518e5bc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 12:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50307ccda28fb667dffe660931fa9872 SHA-1: f641e6cabd2029bc55efbc360deb1c485d182d28 SHA-256: b79408900518e5bc6b6c9784ffc9dd7ffb1de26335978988c62b8a2bccd237a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ntct-dz.com/ckfinder/userfiles/files/mobop.pdf In PDF document text
    • https://aneri12.eu/res/file/robijapulox.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/c4kcennma6usv8q26cb71tcj8p/wutoxususodatonumamixigep.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/593isq1fqb0q6rsuoo1jgnegn5/nifipolipomuxekaz.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/15700899147.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161129331c2a54---kuxuwajixumewaga.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/jagazuferig.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/44333441526.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210626_BCC1ED2BF1BD9BFB.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/u74h3p32oivbi19p7d6cau5g97/wopiriteguxarivi.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b4beec7bd---pitirezo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf943fd4e57---49542741441.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef9b97c466---sevomazivapugoxab.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b3cb90b60---siwebidunulubepevokigo.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jirobezenazokatiguv.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/kuzumobatixifofok.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160822ec1548d1---nuvapevaparawot.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/gugolizisitidobu.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/munejudodirulekeviki.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/84b323d51d54f3b3a3f197d14a6e5224/zikeximuliwubuzux.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/23976828246.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/17937053062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=synapse+and+its+typesPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/18228266558.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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 10308 bytes
SHA-256: a48a44bbccb330b9c7f2cd2e99e8cee779872129af306c5056490b8642bf55da
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 17524 bytes
SHA-256: 34f0311c0fc3eb9906a397edaaac75c4d50736829b0837b08862334cc93a808b
font_02_sfnt_off00012702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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