Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7fa4b089ab1f84…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 02:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69e7d8c204c86eed4bda879d12d9d269 SHA-1: cb249a6ff99543dee9711478decad7a932d066fd SHA-256: 1d7fa4b089ab1f8429443f970f0938998f1fd053c72abcaa93fdefedbf32e0c6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://inwebjor.ru/uplcv?utm_term=turn+key+home+meaning PDF link annotation
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/wojupegajene.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/91785447513.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/595590396.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a684870b309---ruxukabesojili.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/95966661796.pdfIn PDF document text
    • http://billsky.ee/files/file/5983631342.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/vulogegajitekakubu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/63p2us73ato7nas4qgduh06ce1/tirevisubapuguxisa.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160764bb19bbfd---82772131003.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080080f078d1---22129252901.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210820235658.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a5d461857---11817793358.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/67cd3e77aa95dc7b18fc9c9df49ccad9/pujeluxufuf.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/riwovuzojituj.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/60763466054.pdfIn PDF document text
    • https://zold-kommando.hu/files/nurikamoxetanabus.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/674a382839404d65c97ddf20091e3a46/22338368850.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/38405764982.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0c7de389a48c9212bef42b5f49e3371a/18824311065.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/titasivatebatevilekorej.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dep48c0m46rvmlluev09m1nc16/62055134308.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851abfeffc9---60139629517.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/89741683315.pdfIn PDF document text
    • http://imaginove.eu/data/Files/winigimipesinusotudiwuzof.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dff0018683c62230946cd73877650e40/86214282765.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/reravotixewumuvo.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/danozika.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_off0000c469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC469 16364 bytes
SHA-256: 7b994c1b3cfce57e67c971fa9e780146bbd5aeb06b7f7b21beabf4b74963f762
font_01_sfnt_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 10512 bytes
SHA-256: 5a24cab7e6ffe53f8ee3acc0e1b65ab57bcb7069203922c2fae4161984dfc364
font_02_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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