Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90872d55a37c81d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 00:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6e3aa66730a9f45f4f8983b6b0b8268 SHA-1: 3863e24772605b4e8e9898de15b0856f32b76fe4 SHA-256: a90872d55a37c81d56ad7308d0c6004a6f5a66626af80e5b9ea4f259fa6c8a5b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be redirecting users to malicious content, potentially for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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 http://slmj8.com/data/userfiles/files/bixalirunixasaso.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/c7a61d6cf898c3c0900765d8ce8818d3/2886526306.pdf
    • http://szao-spb.ru/images/news/file/jegugunujef.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b23899f941a6d4d05225456b63bde3b2/96313246679.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/h210rr9pa83mk1l9ol13v7rge5/93866888464.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160d09d93dd7a8---64177121879.pdf
    • https://medtek.vn/storage/file/pamofeluvasivow.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/59629599017.pdf
    • http://yossy.biz/userfiles/file/95226819961.pdf
    • http://soft-pro.hr/upload/datoteke/49941830630.pdf
    • http://hasyo.net/files/file/nagema.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/tavetava.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaeafebbe7---32406108419.pdf
    • http://tencanpowder.com/d/files/dewurolidivepujarok.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f6f7c50decef2adb2e1f4861b0dca24a/27951739132.pdf
    • https://puntoagricoltura.it/file/72160771802.pdf
    • http://nationshield.ae/userfiles/files/62101804580.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7286a253c4---87716399904.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f11415f4d---zifavemulososibufogu.pdf
    • https://anmimar.com/royal/userfiles/file/83326778982.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607280376b740---bilejawukukinonirozupowes.pdf
    • http://srtprogetti.eu/userfiles/files/34763336318.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8f58460cb1deb868eaf6c2065b7bb2b4/37442909124.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/62b5b77065bc08a8ce102ae6ff3cff93/58478167536.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=1999+jeep+cherokee+owners+manual+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_off0000d573.bin
300268348168b095ae805dd4bb5e594b4f26396d5897168cbfd9869208ce33e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 17864 bytes
font_01_sfnt_off00010310.bin
342bb0f644bb45f03222ce9a354e973145ef8de2cb718e1f17016d16b0a206f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 11224 bytes
font_02_sfnt_off00011d49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 16792 bytes