Malicious PDF — malware analysis report

Static analysis result for SHA-256 a312b20b2a58f511…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 23:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2e9671f93f601bb49b7eb777b6b340f SHA-1: f3355fbf55e0545dbcb0fd2c65d574d9f42e8f2c SHA-256: a312b20b2a58f51158d26f5d94f38c7a1a25618f77d68314e64298aac9ae5e34
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/69f8ef30297af355ddfabeccdb32b0e6/18280892287.pdf
    • http://nattukoottam.com/userfiles/file/12421884767.pdf
    • https://aradmissions.com/ci/userfiles/files/7101367504.pdf
    • http://hoteldanang.vn/uploads/images/files/dofuwol.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/5cri5k94ts03tvietn17880r3q/patut.pdf
    • http://qianxish.com/ckfind_image/files/39102565850.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/fedolidezegagu.pdf
    • http://csigikes.hu/admin/fck_upload/file/6233820571.pdf
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/15496671941.pdf
    • http://schokofontaenen.de/idata/7175367561.pdf
    • http://fairfresh.net/assets/admin/ckeditorimage/files/19246607919.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c17d0eac24175c52ba7c8d5344c5934f/84938488433.pdf
    • https://sim2007.com/files/73399023982.pdf
    • http://sirindhorn.net/upload/File/zotagaxipukudozujata.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/70124427118.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8079e307b990db2f80bed86b6667f25a/luduvadimawok.pdf
    • http://newtarrytowndeli.com/uploads/files/55274675840.pdf
    • http://warmistore.com/userfiles/file/dijenerugove.pdf
    • http://odra.cycling-recycling.eu/imgturysta/files/91187252817.pdf
    • http://ashokarefrigeration.com/userfiles/file/zipotixozos.pdf
    • http://think6.net/ckfinder/userfiles/files/20210910130433.pdf
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/wewafir.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142400949099---duveritajimesumo.pdf
    • http://smartvoicecom.com/userfiles/xidupoguwoxovagubix.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fifa+18+android+offline
    • 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_off0000d314.bin
52947620179ade0d3a7a938ef689cc9b03390083a51a2f8935e92d62bb6f0f64
pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 17820 bytes
font_01_sfnt_off00010194.bin
db758bc95b2cc632fec1dfcf5104c50d43c176cf6d85a5f3c5f072347ca7f74a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 10320 bytes
font_02_sfnt_off000118e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 16792 bytes