Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b741a02382320aa…

MALICIOUS

PDF

82.2 KB Created: 2021-08-31 23:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c42eecd10748734371c04d283e3614ae SHA-1: 564341806b469577ba390cccc26fd490a19e029a SHA-256: 3b741a02382320aa901d8764141490c739bb60767d09310ba9836f82a32c7d1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/263a5f55d64d09c790624c48a167de76/19916842833.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e1dc694e0---gukaxosewuzolanujukemeg.pdfIn PDF document text
    • http://nicosiacaffe.it/file/fuwupax.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ada7e084---mesisedazivadegatoxet.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/65352844687.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/befimufovukotosudujiduno.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/73578570897.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/savuwalemizotolura.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/51232246958.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/mafafoniwitavemefiv.pdfIn PDF document text
    • http://lagrupacio.cat/file/wetatakivopixalakogoso.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/dewogajelomomamu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e65ee7d82be---5668117778.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cf4vstot9v9pi3ejbnmhn2u547/ribufu.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/80494135697.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/sugimojodojo.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/nunefi.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/juvazifapeloxebenoxe.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/kidesaxijulokabi.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/sivas.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/gikuninavatu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/15lfq49eo04tl2osa9k2lj2j5k/96932313439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=would+should+could+mightPDF 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_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 10412 bytes
SHA-256: 9bfad52858bf53baf7ebe1a2ddde5f28ef4d7532be725145f1daf8936e817ab6
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 17168 bytes
SHA-256: 61419d087b30ad4712d315589229b957cd1828f93f5731c31558821570508cbc