Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7a626d660d1f1a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 15:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 237b8adc2bafc024d95748fdb84073fa SHA-1: 1c53c8eae7415507d98aba3ea43a8943ac9465f5 SHA-256: 7d7a626d660d1f1a5096680e27697b059adb27688ee2460870759e8b39150dad
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, forming a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=android+convert+video+to+gif PDF link annotation
    • http://nieruchomosciklodzko.pl/files/file/kipotafuda.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/giduzumanakafij.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/dimifexudukuja.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/kukomubelo.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/zadolufoxenanu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613176693c1d5---12670194119.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/46408264308.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/fozab.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/wodotase.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/50358798060.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210907165604.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/88084630248.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/36776996993.pdfIn PDF document text
    • http://kd-council.com/upfile/files/duditudewuvusexego.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/rufox.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613154b458684---wojazasowivimazatarar.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/raton.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/j35iiv969a6c64shmh2f8eosm4/jaluferadokerirumuxavoru.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/bekibixuvobo.pdfIn PDF document text
    • https://beautydent.hu/editor_up/tixakewetofifazosar.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/bnbj0okbu6eqjh271c5dftrss6/18488989926.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109080628581798.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/48790772117.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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 17960 bytes
SHA-256: 92948f6a5333261e6e2603bee1294b4f72219957d8aaecfa40ad4a703eb374f9
font_02_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 10324 bytes
SHA-256: cc265b82835f7338b70ecc715baf3ed6235f3ac248417da2d1257b3ab7dac9c2