Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a5e5d95897a42a…

MALICIOUS

PDF

156.9 KB Created: 2021-07-03 07:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ddeddba208428d4f392e625cb4c0791d SHA-1: 0bbc727564212f8ab31a2d27bf854e19f1463550 SHA-256: a6a5e5d95897a42af7eb7421109c68e4138f7b6ecade363abdbbcb2ee40232a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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 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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/826d869cc24b315df2ccbc0b6996fde9/roregeli.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd90e56a1f---wififuxurojofuzovugozu.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/xajusaduvibenekaxasato.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607950c89b688---fezafikilajusasivana.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1hs8k5oov9bd6sdu0dt46mrqj0/60554407398.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca21cca5d---lekabi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210611064708411.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c91dab6eab---fegeri.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c63e92e4a77---30352939912.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/46493998355.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/nobenulofije.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3d4c9459---naxamixusosowajegupujo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c27527b2ce---79634293643.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/pojapodimomigogixe.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/niwiwafadelak.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/xalomi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5debb07f3---14111184904.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/80194682500.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073369a7f9e8---gigaduwafofosa.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211d68263c---48421262911.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/fepomeremum.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/df7e73993dbb51a98c72421c81c77fbe/2216690962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tourette+syndrome+onset+agePDF 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_off000205ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205CA 18792 bytes
SHA-256: dcf98b1a4d015b21287f8fa4b939e9b0c1320ae8b05ee5a03ee4fa3749a1e71c
font_01_sfnt_off000235fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x235FE 10628 bytes
SHA-256: ec5d49b0ebea3202fb884b7e1d2ed124896794e1d7027ed4ed7e3d7c99b20209
font_02_sfnt_off00024e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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