Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a847b36bc7adf9f…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 18:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebd43b01b5262c0079db8a46c99e3722 SHA-1: f35d4f2da2cc4051dd5427ed202e52111bd29cdb SHA-256: 9a847b36bc7adf9f47d84f39542179f4e1ad693d670b13a1cb2306efbedb8121
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. Numerous heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=ethos+pathos+logos+ppt PDF link annotation
    • https://bandotrading.com/uploads/file/48593992735.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161427051e069f---81122014664.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/numefe.pdfIn PDF document text
    • http://gojjang.com/uploads/files/39994753322.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/43264456249.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/dolurigikol.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/37559422244.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/86313319125.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/18269922496.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/nu4s9vetm6l1gsgefrggo0bph4/nusejasasusixadixejatipaz.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/46229217139.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/93438541648.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/77207182464.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2ebec503b6c4f3d23243d2bdca159587/popegofidebofakidexasijix.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/5603488148.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4d6ecc5ea---norigotitepovexegixugafo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613986210b177---ketulesakuzekuzebaworumab.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/088b8ed91c901377d6627eebcb0c7203/36635914732.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/46412735610.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109071619354500.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/fubalidugijijezubetul.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/73915006920.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9636f1528863ad675323bdb88292a502/jovakiwulebito.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_off0000bba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA4 15824 bytes
SHA-256: bf1b2b7c787e3e26d2245d0ae2782f3a92e3ed6afb651f43750c83da661f4009
font_01_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 10084 bytes
SHA-256: bfbcff45ca6d207f51478541cbf1b9b8dfdb6fd2426cd074db82196e1dc4a2e0

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