Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f63c5662f9b7b4…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 06:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 455dbd57b1341180f704fc5f0986590a SHA-1: 71c317f97a31c6676c42be27fe6ea6729246bfd6 SHA-256: 02f63c5662f9b7b4f414c80718874282c54a95f07e485bbdbd67ad4d015ec149
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised upload links points to an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5fup92m96kb52r4vcablq337ol/57482753236.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160791a10a8338---11075542623.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/obs9m5gclp3vjvv3tinh98k0e5/38180136490.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6f5bcce5---4167136002.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b5de93f701ff558e07a3a8f8cb32baef/29489961213.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ada0b0f8---8695680421.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/tujitawebepafe.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a2a1e11be---nivufomuzod.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608334c8db6a1---dobivusuru.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c288f59c857---84103893577.pdf
    • http://crocepadrekolbe.it/userfiles/files/rujodogipopetuzu.pdf
    • http://cottoneauto.it/userfiles/files/kazolixararigoz.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8fcb0ee4---88075397088.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5acf3570b3---36690885381.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d29061a0047be2a0e003768f8ee6000/97278634527.pdf
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/dezerobojibijifil.pdf
    • http://kpdb.org/userfiles/files/lawotikugawu.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093580535bb8---soniwutabu.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/98aba065e89ac2b05e99daf39949f6db/37290823652.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608562d707830---mebitiravekifabekojub.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/1e7bbee609e0962797913ac6231ca133/jizaruteziwiwuretixeduwu.pdf
    • http://maychamsocda.vn/images/userfiles/file/vopaxividoseludoluxa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=advocacy+for+people+with+disabilities
    • 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_off0000f739.bin
0a1b093f9b3f69facec136dfbb230f6295acc387e7391ca20f1e9fd82cdf4503
pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 11000 bytes
font_01_sfnt_off000110c7.bin
4eefd240776b8afa762d8322758fcd2ca93f765dc1fe9eba9cb64f7b4f92215a
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 16936 bytes
font_02_sfnt_off00013c68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C68 16792 bytes