Malicious PDF — malware analysis report

Static analysis result for SHA-256 767ef579018b71b4…

MALICIOUS

PDF

90.3 KB Created: 2021-09-01 16:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbc33bc95fcdeae9452e7104290bf8e2 SHA-1: 5857e4d5f4b04d238aded53bf81035ace083b02b SHA-256: 767ef579018b71b4446c0b2b30f2bd176ce40efbba60c3f5e786cf95580f55ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://littleitalypizzany.com/nbloom/fckuploads/file/fumutogiseneradonoforogem.pdf
    • http://avon-bratislava.com/files/files/12576659919.pdf
    • https://luyenthitoeic.info/userfiles/file/vixirej.pdf
    • https://rm-parketi.si/uploads/73132107758.pdf
    • https://birsamundapark.in/userfiles/files/81721927068.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160794ff458c31---kugako.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a491dad49be---75304426164.pdf
    • http://chamdure.com/DATA/files/58297181471.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/zafipupusodujuvinavokaxum.pdf
    • http://trips-in.com/ckupload/files/kulepizakukupipirefipu.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081bbd4db7bf---94546820436.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0a6e8c5b85f05e439b1a7885b449f405/70944860577.pdf
    • https://jjpremiers.com/files/sosagapag.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607691ab8a890---momil.pdf
    • http://wildpflanzen-planung.de/file/8158539714.pdf
    • https://chasehr.in/userfiles/file/muxeko.pdf
    • http://ned.ru/uploads/files/fezusufapoduwe.pdf
    • https://duproject.com/uploadEditor/files/58615167212.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890987939aa---tasujilibawepaxa.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b7de01db2---18758370326.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/0ecbe4da7f47d5f0fb30e307563be4b4/vuzebaduxum.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3dc23a39f---dabisudokevuvul.pdf
    • https://chataigne-cevennes.fr/imgs/files/janonopilupevuvemixiweraz.pdf
    • http://thermcom.cz/userfiles/file/97730345568.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/t04i48gbmhbpe5h10b4parppb9/34851575304.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=streaming+one+piece+movie+gold+sub+indo
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 16792 bytes
font_01_sfnt_off00010f65.bin
5fd53a262859630298ec1b9adedf9f7fe6175d5df472b034a90f52ba1be21744
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 11240 bytes
font_02_sfnt_off00012949.bin
7add17224835266a91ab04d9be958d42bcf779c7b14d5f75d4149645b6b22588
pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 19280 bytes