Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c728d4116edf01…

MALICIOUS

PDF

108.0 KB Created: 2021-09-06 10:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b89e8d78c40f0f52bb92a3dba0a42c93 SHA-1: 676c5de2f02e841cefeed80e6e6a7494fd28ae65 SHA-256: 55c728d4116edf013987b24b65017e920ebf8527dda326e45685dc6de5f997a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://garglob.ru/uplcv?utm_term=glencoe+algebra+2+practice+workbook+answer+key+pdf PDF link annotation
    • http://piqiso.ru/userfiles/file/pafugebowosera.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8auvps81vr0eupi4c3ofel3fgp/zimegogifagu.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/55148347384.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/rbae67kc5bk2d7hihtmo5ckl5p/15205806489.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/43912079058.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/luxezixenajiruwosanaw.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/manubebalunifa.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/bajowiliparutejotukutare.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/4332178636.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/bedaje.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/lixasizedopidusesonun.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb864c0878---buremusal.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/suwazigonawalikes.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/97104544556.pdfIn PDF document text
    • http://17njl.com/userfiles/files/bazodoxigigovuwudo.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d25660750---dojopa.pdfIn PDF document text
    • https://papiratisk.cz/soubory/dagetogor.pdfIn PDF document text
    • http://dsraxys.com/uploads/rivojifumotonofeg.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae1191cf6---69688501824.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9e0e9deb8fc315da2c9f116042adee59/lamivet.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/62056788660.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/zonepeloxadu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ouvvnbq7o54l33dl6fja7j6t83/xakuvebotezod.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/94488925300.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/10424637542.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rozafiligux.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_off00013f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 18412 bytes
SHA-256: 181d23edcb68445943709b9eec91a31d2f7ad626c3daf3b7047bce89931dbdcc
font_01_sfnt_off00016f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F02 11388 bytes
SHA-256: fa646edb5dc22c0a08727c73a540601062ca00a6991d68a5bff51fa782723e38
font_02_sfnt_off000189b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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