Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58ff413d861bab0…

MALICIOUS

PDF

98.2 KB Created: 2021-08-02 20:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40e07e6ceb1ddf2a5940429a08d521b7 SHA-1: d9fb7aa8aae3e77b719fae11d2c5d33769d06ea8 SHA-256: c58ff413d861bab0d75db6f2bdebabb9d9f7080e704222aaa3bc535e8ea67a07
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a malicious lure. It contains numerous links to external sites, many hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to redirect users to download malicious content. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=cimatron+e14+full+download PDF link annotation
    • http://webbuilders.com/files/file/29319407152.pdfIn PDF document text
    • http://willbramephotography.com/8775891251.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1377800be01df9ff5b2873cfd7c22fa0/gasizu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d21d1f4b556---99275120297.pdfIn PDF document text
    • http://dgjst.com/upfile/file/95319183441.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/81513ae439a494760a7a6ead0339fa44/68750982766.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/712dc768c3e9177b92ba5c059d6d2650/37669275110.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/79449568072.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/zofoguranowopomakipokazu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e0996648---mevoxeladipeweges.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/depotevidedimizademajiser.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aac190a0675---21530856304.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/36272485093.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0eb23ed093baf2f86dc02b8b79ea4eb8/xakebiz.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e484a40ec---bopagedenurekesuvize.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92d5cfb98---ferizowenutalonoropabusoz.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf54e56f54f---89095764456.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081178b0bb49---27152486582.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9c43e71c---94961717703.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b077bc3961e---72230640000.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/b2960b388350c45f18bb69268faa69fa/11146709703.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/81655783229.pdfIn PDF document text
    • http://immobilgold.com/file/fubaruwobirorofik.pdfIn PDF document text
    • https://aaaxxion.info/images/file/99656527166.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 19524 bytes
SHA-256: 3af8e4b419f03315d34010c886f85f45700bbf0ee48b654f851649f9447e38e3
font_01_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F1 16224 bytes
SHA-256: 34f457a581f220ff667b1ec71505446b3f2f67c6bd92de300d080fe6c95563ff
font_03_sfnt_off000158d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D5 10696 bytes
SHA-256: d222139d62b8c3a4e69e8f27a5be86fd173e5b6db17f584a8b91cf8fb99b6edb
font_04_sfnt_off00017173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17173 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13

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