Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfbc1fccca1927f…

MALICIOUS

PDF

119.3 KB Created: 2021-09-01 06:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67d558f2350956c672bd8dd435e9a65c SHA-1: dadaf45c8fd3030532650d398f2e28d41098132a SHA-256: 8cfbc1fccca1927fe2181dc824e4d44d5dd557ada2e0c7d80c33bbf7d4dd4a1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like nature. Static analysis revealed it functions as a link farm, with numerous URLs pointing to external resources. Several of these URLs are hosted on compromised WordPress upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hiperaktivite.info/userfiles/files/kojowapazes.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3r4blf8cegcbsih31mgnor9mh3/zuzoden.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/39081343784.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/65136369582.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9b8e72e52---55500852802.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/dikojumujitufokujetaw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fagoposot.pdfIn PDF document text
    • http://ledins.lv/cms/file/desasojuvusovogag.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/15802720911.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/bimafibul.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/596qvond5rnjcal0dbbscfv3j3/50437127752.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fagufureli.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16126ccbdc1474---25131811996.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607189545f754---19516541884.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/94745564619.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/56dda679cd939f9611d58aafb0dc9450/wobuj.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/wefis.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/50868591431.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/12563797520.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/23178167519.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/prdscjs5mk4p1s5lc8jm8g4ubm/46677353081.pdfIn PDF document text
    • https://argumentua.com/i/file/31588497970.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/15253329857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gloomhaven+jaws+of+the+lion+scenario+book+pdfPDF 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_off00016657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16657 11436 bytes
SHA-256: 058ad6da123f7d36dc20b4ffa7a58ebeb40c832ff740b4daf77d10772f493764
font_01_sfnt_off00018102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18102 20984 bytes
SHA-256: ca75ecc30e469f89b6dfab298e70130294cb05b22ae932935c2872cfd80626d0
font_02_sfnt_off0001b77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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