Malicious PDF — malware analysis report

Static analysis result for SHA-256 5250476b12ea8245…

MALICIOUS

PDF

89.3 KB Created: 2021-07-02 09:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a0800afda1e6aeb7ec650893c7060c9 SHA-1: 23bbb8643aa05f4b043457672a49edbfc04393d3 SHA-256: 5250476b12ea8245a5c24530711c524b4592d54ceb6f2fb5d3b18c60cfcf3f7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://fotografiafrancescosomma.com/userfiles/files/40792226930.pdf
    • http://musorcentrum.hu/files/article/file/94691216657.pdf
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/39086484385.pdf
    • https://client-sms.com/ckfinder/userfiles/files/vaziraweleket.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/51198f59237627a653075d5c24cb4b14/meruxumokugasudapewenu.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e45c6215---32287291286.pdf
    • https://securitydm.com/slicice/file/nigijetumibekizobeluneleb.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf76166b2c---89582171594.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/562333023dc346f3eda2147eb6d2db87/62047081307.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bab50f03cf---rituzebanefagasid.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d396684cb---fekakozenafolafos.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/bivuv.pdf
    • https://mgrenginiai.lt/ckfinder/userfiles/files/82944203862.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32a00194d---92164201478.pdf
    • https://majorsagilekvaros.hu/uploads/file/fajawimusimubeg.pdf
    • https://esz.jp/img/editor/files/51397860933.pdf
    • https://hanahana.vn/media/ftp/file/nizabotezirunewa.pdf
    • http://alexhofford.com/temp/files/file/wupenug.pdf
    • http://ahcxdq.com/uploads/file/301427484533.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6d1f33263---49479978689.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab3ffcacec---18653903266.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c9be982c1b---tovatutamawefamapatenovaf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+get+a+new+id+if+you+lost+yours
    • 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_off0000f93a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 16792 bytes
font_01_sfnt_off0001114c.bin
a94d24e8501a43fd8db0274c346ea37b8c94a61d8eec7563801f6a2f588971ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 17024 bytes
font_02_sfnt_off00013d39.bin
54fe24af0dafcdb434b2bda020aea054088ee6f269ea5e8f92faddaa16c86a28
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 10820 bytes