Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b86003cd8972726…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 22:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 010b3192e28690e79f41356eac50f693 SHA-1: a421c29b0e6ccbc83cc17023b7ef7cfcf36113fb SHA-256: 1b86003cd897272668c931a4c133dfc990c683ab7fa3d20747da70cb84e6b36c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=kane+and+abel+pdf+jeffrey+archer PDF link annotation
    • https://tectrongim.com/uploads/files/xovelinubabasafokusoniv.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/53830014849.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8c46e5b7a3cf24ec0b30a58f6ec033ce/87450527764.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p599qbtlnohbff3l04d71effhi/41999121579.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c74baa19920---3380130085.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/gabapilobekob.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8af85789deb74b73bdde9c9acb0dd55e/36990563551.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/biminotuzelozobupixovigu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/funodopisoxamivuri.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/purodegemizofoxelupubifok.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/zeremubewawexuwuledoses.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/jiwiniba.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bbce3404f---8467377390.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/j6r3867hu6vl4fpp2f64a758il/zopedowisikavedejoluti.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/71859318851.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ddcb21bf---mazapupaz.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mogividabufifar.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ds76sccvlnrd2ob2j5dpibef7e/mujuvazatuguzokejulonagen.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c175b02e---pusoluz.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ee687e3c7b9ef0f0674b4efbc19e8935/42607247960.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/fodivefawaruritimos.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/degogojidifevevogiso.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/j21hrjqle3jtu6k02adrcjk10r/99231202183.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/35752281924.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/penudubilolu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c311290676e39bc258c3dc920e19dbb5/21561425213.pdfIn PDF document text
    • 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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 17732 bytes
SHA-256: 7057e77bf2936e8ec4f31ea87179b79605e9f94b9a826d924d25c32d12a793c8
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 10616 bytes
SHA-256: a362d63af8a41bdd837f00ac81be4c9f59419256ec149e9e761a35452b81c121
font_02_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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