Malicious PDF — malware analysis report

Static analysis result for SHA-256 d738319312cd1bec…

MALICIOUS

PDF

71.1 KB Created: 2021-09-22 14:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34aecfdd913d3318b3fffeb18e3086e0 SHA-1: 14cc1bd1398df11a4e4c9d1b7c4605523e3ae8f6 SHA-256: d738319312cd1bec7757236ed58f9b687d7089910ebbc810085ab3b7bd3bf1f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=how+to+install+nba+2k20+on+android
    • http://yuanhebiotech.com/upload/files/42332848687.pdf
    • http://siamsankyo.com/Uploads/file/13696278881.pdf
    • http://zavalinka.by/var/upload/file/jivun.pdf
    • http://liavanhaeringen.nl/userfiles/files/28003374006.pdf
    • http://stillincontact.com/images/mails/file/5155149315.pdf
    • http://jawarakreasi.com/file/lowid.pdf
    • https://pinyardim.com/calisma2/files/uploads/takizodezanijoj.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613f955e9e171---998836503.pdf
    • http://uhy-th.com/image/upload/files/fagenaxaluf.pdf
    • http://taixingchem.com/uploadfile/file/20210907160202054.pdf
    • http://pro-group.ru/userfiles/file/bowafosiserojujoke.pdf
    • https://rumahbaruku.com/contents/files/bipanodedi.pdf
    • https://natyabio.com/uploadfiles/31244493606.pdf
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/28909001778.pdf
    • http://chiesamadremarsala.eu/userfiles/files/21503927644.pdf
    • https://cuatudongsaigon.net/uploads/files/jovufuzu.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/126f61b7e933389e8b522c63453885ae/49776982959.pdf
    • http://zhengfutz.com/v15/Upload/file/202193256245126.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/da95f326292f77000aae09374895b839/70220279276.pdf
    • https://residenciasanamaro.es/userfiles/files/16916115173.pdf
    • http://crosswaysrecruitment.com/userfiles/file/65281021458.pdf
    • http://clerus.hu/files/file/manususokewawozu.pdf
    • https://medtek.vn/storage/file/mezot.pdf
    • http://traktorpulling.de/ablage/userfiles/files/47354204517.pdf
    • 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_off0000b524.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB524 16792 bytes
font_01_sfnt_off0000cd3b.bin
5a83019f36a09b98f17df6ce7dc4567208d275810a7d53f745b17895ab383bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 10660 bytes
font_02_sfnt_off0000e5c7.bin
28b5f1ccfbe8a1970bccab47d646ce6d630ea84a72229d908ef319661fc83428		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 16048 bytes

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