Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94bb224cb95a554…

MALICIOUS

PDF

114.1 KB Created: 2021-06-29 13:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea09cb680c5db150e6b4e6c375e61ebe SHA-1: 8ef3068023dbd45cc4bebccfaff163b579d8e76e SHA-256: a94bb224cb95a5549767b5f3e5ef50027f9e1554f0c1f82f6d2acb5b908509a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c606de5aa---84706831628.pdf
    • https://agrimal.pl/userfiles/file/96918833574.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/93272997917.pdf
    • http://righetti-ticozzi.it/userfiles/files/mesofodikojotemata.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983cd5b9470---35159944951.pdf
    • http://studiofranzoni.eu/userfiles/files/26065233981.pdf
    • http://lev-steklo.ru/userfiles/file/mexajenijofis.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6eaa7aca693b78222fffc99fdde94349/totopofiruwivez.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf88f71173---28191808838.pdf
    • http://sp3siemianowice.pl/userFiles/files/11571701883.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/269d9aeb01aaf30adf778e45674be3ef/81246351512.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/19e1d6f5d1576446a2e5612f49a7f954/23384450627.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607778f8cd1e1---52569407888.pdf
    • http://botosani.ro/img/uploads/file/vopoguditesurafagadalag.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf1fd99252---sowewox.pdf
    • https://cplastik.cz/data/cms/file/43559125844.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f62a6157b0139c536578275541ab7df0/67084743564.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c965bd79d75---17581668560.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/844e5f7ebf6598755102b87d1984f56d/gukidebifijurotinaki.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765c20f1314---35380443130.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/n5egrch13pa4rt25g37i40jjp4/30165045526.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a150de6d86e---24383948680.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/bonusozamile.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f4aeec6a464218c3f7fe8f8706341209/tutowugarelomeziviworilif.pdf
    • http://dlmberatung.ch/userfiles/files/ramikawedajirulufugevaz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=material+possessions+synonym
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 16792 bytes
font_01_sfnt_off0001458d.bin
835c426688a123352ccbe402639bcda84dae445da448881d9e44910583bf3069
pdf-font-stream PDF embedded font (sfnt) at offset 0x1458D 16544 bytes
font_02_sfnt_off00015cbd.bin
a66872e97aed96ea7bef06c2877037bb19e534104326560fbcfae5a77f4fa96e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBD 10520 bytes
font_03_sfnt_off000174a8.bin
0a5034f8bbc22ac14fe5465b7b7c2e488bd3b39d3f0d45390d3817d1d33d6d51
pdf-font-stream PDF embedded font (sfnt) at offset 0x174A8 21372 bytes
font_04_sfnt_off0001ab14.bin
76e32c313df76a41b544cbc0332454995b6e5d46a00cb9a70dc076152411dcdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB14 3304 bytes