Malicious PDF — malware analysis report

Static analysis result for SHA-256 423aff08aa250e78…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 19:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17635826f3be55df4db666038f41e0f1 SHA-1: 701c135195d40e8ed2dbacc9927d322695ad7ea5 SHA-256: 423aff08aa250e78d2c6237754a662c01678b106c423168518ae4f3f624b15e9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to create a large number of links on potentially malicious or compromised sites, likely to improve search engine ranking for malicious content or to host phishing pages. The presence of embedded JavaScript suggests the potential for further malicious actions, such as downloading and executing additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=interview+questions+for+sql+developer+pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/lakejovafegotixununu.pdf
    • http://geoman.cz/data/file/bojazuxojejagolifu.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/33719a164c4676218670aa6a532dab73/64116177507.pdf
    • http://fireprovietnam.net/luutru/files/60126981326.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bd36cdead5fdbd195e1ad329e43bc5d7/42949318974.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/c2fb62170f5eee03878be40db2f019e5/45640339862.pdf
    • http://garage-ys.info/js/upload/files/31849459631.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/674282453f8d317f2aa917a04c6d9090/bolubelesel.pdf
    • http://teenaramainc.org/clients/875997/File/90547833921.pdf
    • http://ascensionchina.com/userfiles/file/8573347298.pdf
    • http://aite-materials.com/upfiles/file/76320087513.pdf
    • http://studiotecnicodavico.eu/userfiles/files/73126717638.pdf
    • https://centaur.vri.cz/docs/files/wonasefijekamala.pdf
    • http://cloverdiamond.com/file/repop.pdf
    • http://hanabi-la.com/uploads/files/42246931945.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vhmu4knredgiejfhg5h569fa8i/rufubedenali.pdf
    • https://aawyx.com/sites/default/imageuser/file/jelakesanugugazasim.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5184c8085ba4e33c9c601413f4014099/48014211898.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799cf566cdf---tigiwezopupebe.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/daef745865a325556fbea1215313d1b2/zapaw.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a28a954a1---14684309985.pdf
    • http://cloverdiamond.com/file/78251054761.pdf
    • 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_off0000bc82.bin
cc481837c23015c65c264ef5be361a647602c9a9a0f64a25ecb8b3e226b51c6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC82 16980 bytes
font_01_sfnt_off0000e824.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 16792 bytes
font_02_sfnt_off0001003b.bin
72f0441d4be582e390d8001fccd6c6b4390ee84df6559fcc417c775a6b575394
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 10680 bytes