Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad96305522006ebc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 01:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d931726bd532c1e1556bf353a3b02d34 SHA-1: ef6818df1a36121c44cac28c68dde8762fdf7e57 SHA-256: ad96305522006ebc7f45e73f08b0a53e0c4d92e0a1cd5daba6a264a52bfdd34b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which are likely part of a link farm designed to redirect users to malicious sites. The presence of 'utm_term=mail+body+content+for+sending+resume' in one URL suggests a potential phishing lure related to job applications.

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 http://evohome.pl/userfiles/file/zigadugozizijoxifuxa.pdf In PDF document text
    • http://montagnobozzone.it/userfiles/files/27038913302.pdfIn PDF document text
    • http://yibetter.com/data/files/23692611847.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210904085457.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/xapofoliwilomibomusunawa.pdfIn PDF document text
    • http://rafaelokazakov.com/file/gekimodawebumoda.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/vafakutag.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/37597252453.pdfIn PDF document text
    • http://techbis.pl/files/file/40359623446.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/68269510534.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/864c78d8dbd590b5f4f98fd8d5a6c778/25535343532.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc03446ac3---49001603453.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2602c6fe12ed4917dca1235b9263a2ca/35868395566.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/dusadolapovevumifagixo.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/musevemebugodugajit.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/kojoxegodezumanol.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/kazonaralasedazifavizogix.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/1012597160.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/vebawiwalikapekewaxeni.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/92809609268.pdfIn PDF document text
    • http://df-2.de/images/daten/file/tifowakujufus.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/56455196990.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/dewewuvubaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mail+body+content+for+sending+resumePDF 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_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 11168 bytes
SHA-256: 4ccc311b68208e65756be58ccadcd0378510561dd4b5f35335959d2ff11eb4b6
font_02_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16932 bytes
SHA-256: c00ed5c858c9e475f12cbe6709b3994f2b3609e11653866bf4af1cb2ae2e5323