Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6c04ed532f15b1…

MALICIOUS

PDF

133.4 KB Created: 2021-07-14 00:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 741baf9ee9d5720b958df1772645bfd0 SHA-1: 86caf0e4fa16bbb106013e3c7649bc685af9339b SHA-256: 4e6c04ed532f15b1523220f5604621a4481452251a294d4eb18bb7ac4309c024
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious payloads or phishing pages. The presence of external URIs and the overall structure suggest an attempt to leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://meble-tk.pl/userfiles/file/volopipimezivurujiti.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fe63222fc---89937081869.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098f70a20ece---91153542656.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28cefcc115---34691774558.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160dd77f67f49d---39024297088.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe38b0506---31835097925.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8cf0fa3b74f3241f81e3bd53654be9d7/38635807791.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0242c5108641732fc78047bb1f7acebf/keneligazuje.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u320rt8nc64lr03a11d62po27p/xapokimonijibiditut.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1620947308899891904.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/16bf09l9tscam0lmf4meeqsmjl/65624908091.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774a4aa5a4---98691486680.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/zivuja.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/95344476543.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6a8367a8fa6305468d5cd1c0063eb631/45147514123.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e446ddae7c9eb80f87c0c28b2fdad1a1/ziroratafokajanuluzomugax.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/18/gusunugejutaxodavubex.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/dajorofisekoxis.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/kovuken.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd47a154a---64266324156.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ad85c2b4172ecfad0d7a34515fc8ba0f/mizuzajirefora.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/woradikunuvelo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608efb4bd6116---lujusoliti.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c2f165f59---vojexuzafaxif.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f5d0e9cfd07eac10151eca3f451f3e5/387456261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=skam+norway+with+english+subtitlesPDF 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_off0001a2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2DA 11164 bytes
SHA-256: c0a1f98f21a28d1d0c13b7e519c67bc372482cb0244dd34441bc890a33bd8d88
font_01_sfnt_off0001bccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCCC 20340 bytes
SHA-256: b0af6a70602c287aee680efd63c34e79b0c36040c62926142ef5e0480d3f9f8d
font_02_sfnt_off0001efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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