Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abefd901e083679…

MALICIOUS

PDF

98.5 KB Created: 2021-07-24 13:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65327a1183f3ddc84b79a338abcbdb88 SHA-1: d50d7eb31936805eda6b7e3613d72fa980b45c2d SHA-256: 5abefd901e083679797e3ea817061f1b1a6a4e8034cc0ada3bf6297f83656951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for phishing or malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/43f0ac4173b334fdb841d164b073fc3b/9269459075.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160721bb514dea---soxodefovakosokonij.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8cf28a809377e31d4bcd95eb53a746ef/21154794885.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bf03e445537520f0910fcb8a17320ebd/rebasejotunawor.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/xuputalatuvaxa.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d916de4fc---divosavisogizogokowozokis.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6385f230ef3596bfcd3a8bfe55476952/74523186698.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nulinirisobodagusid.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/lijanunetox.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7d0cd9ae---lupobudatuzera.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021042911194527.pdfIn PDF document text
    • https://agatanorek.com/files/file/24050076696.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ju41iun69fhv3e3k9sui6r26ak/vazozimaliserinomi.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/84236936808.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a7d27d1a1cb519b0c3e3be3b71f74370/kezekipetitotavipenu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad197a7487---soxibekejisisedelinijarew.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/37d53b7b2fe31b2943b672532ca04f81/luwexubaxavuvola.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d52054bcf---rabodasedukexo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/5047370510.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb093d823b---10698673098.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c042f38aa8c---bovunex.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/45071528901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+does+a+tweeter+workPDF 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_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 18920 bytes
SHA-256: 2fb993985dd3409c3c534e57a18bf0c93c45cd6a5c43b52b5c7fb96be8f57c28
font_01_sfnt_off00014d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001651e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1651E 10168 bytes
SHA-256: 37d8fb5a7640e0802f02bf44cfb192a8cbd6a425a0a09ed91e1ab87ad463d59f

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