Malicious PDF — malware analysis report

Static analysis result for SHA-256 f735e580fe709d2a…

MALICIOUS

PDF

97.7 KB Created: 2021-06-11 05:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf50e865eb19f349217f6a9210536d0 SHA-1: 359771c9238a78692fcca53a047927ae05409cee SHA-256: f735e580fe709d2ab1b67d74fcde4858e1bb29169d08cbfa96434cc57ca1167e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, indicates a lure related to 'epic intro after effects template free', likely a pretext to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=epic+intro+after+effects+template+free
    • https://coluer.ir/documents/file/vajafuralo.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/60591709347.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/34dclpm3ul24iqpbo5gthdneib/35445484070.pdf
    • https://ahha.az/userfiles/file/rogarobunomi.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/078d1e0d5a88e758fe14e4082dec6f85/nezegago.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9cf01350dfc109572757f71ccf9b7877/misejem.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/272ebbf0f8199e9ddd66b8ab1157b2d4/62217004489.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc26a9bbf---rexibaxozi.pdf
    • http://provia-events.de/pics/fotos/1/file/kupulibena.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/3ca34f0c6e15bc2f85ca7a7338575903/62448141457.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c355c6224---makalatibukakikotavilor.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7ab402cc4---73070934327.pdf
    • https://mmszke.hu/files/file/63886344166.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085088a7b683---24453772222.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hgidm3dii58448ed735kmrfc81/65568693244.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bep1tf40uqnu051q8meq2jmvsb/selutowej.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/nanuwixelok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001094d.bin
4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 6588 bytes
font_01_sfnt_off000119c6.bin
0ffffce3d55348d64d3ecbbbaee31e0621f77cc623bfb9bb5990caa2fe36f1fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C6 4908 bytes
font_02_sfnt_off00012a4b.bin
0e1c45aaa193fa6dba181b0c63fdf4ffc126df986c684ef108b06262e48cbe3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4B 12360 bytes
font_03_sfnt_off00015434.bin
a1e2968ca8c7638dd4bef022e186f3fea2b098bc52bbc7b81535a6634822059c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15434 16060 bytes
font_04_sfnt_off000168c5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168C5 4324 bytes

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