Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e3db6183de5bef…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 23:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de4149dc06572dc795b7ba2886d7486f SHA-1: aacbd00a89c0b17649e8010c868c10ad1ee50bce SHA-256: 98e3db6183de5bef22349b3cd7708e9f715a948d2a1ec5c25674d09de44e6b76
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms on potentially compromised hosting services supports the classification as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ad23158606173dd9b28e6d87d36ea075/vozixutabanogosulima.pdf
    • http://thamdinhgiadaiquang.com/img/files/28702800261.pdf
    • http://autosoftware.company/autoresponders_images/files/98914107423.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/85b20837bee1d7ab5226746e7272aa20/76603865983.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b73795394b7---23749087720.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf0fbff4c---rolukulumuxekonixaliv.pdf
    • http://agiusfuneraldirectors.com/files/file/61746621387.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nf8js55tii72d7alcbe04qvv4i/bojipego.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b884edc68---7837434745.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3aa47b47b88c159a02fc90729ebb9a4e/61061772289.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe49399c4---53764631207.pdf
    • http://ankaser.com/userfiles/file/renifefekafodevig.pdf
    • http://garmagostaran.com/Upload/file/59412068276.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/73830e2c9c0fc33004e9614dd23d83bd/36731686429.pdf
    • http://arcomproltd.com/userfiles/file/12382998116.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/jncrkn8uepd8g9jf86s675l9lr/fidadafavitozafupuguzifo.pdf
    • http://high-keenltd.com/userfiles/file/62569649347.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d4da3dadb9236954398644268a6182c8/69868453479.pdf
    • https://binarbaid.com/public_html/userfiles/file/37370199629.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gagavunusunupedawe.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074521600beb---bixekuvefak.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2d22d8d0---vitajazenigibaxekobow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=diary+of+a+wimpy+kid+the+long+haul+read+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb7.bin
0c9f65141b1676b35029bb44d230ed6a86db6631044f133fb5c4a59257f9c99e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 17188 bytes
font_01_sfnt_off00011aa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 16792 bytes
font_02_sfnt_off000132bc.bin
655b561296d958952195b0fe125694a98621b7f7beafd2c36e7804628ab1ca24
pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 11168 bytes