Malicious PDF — malware analysis report

Static analysis result for SHA-256 442788f9f5df691f…

MALICIOUS

PDF

99.2 KB Created: 2021-07-20 10:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d6a40630d9ff1463c4c46147e701d3d SHA-1: cce6974a1bb8e7634a3a8c52031bf460795d5391 SHA-256: 442788f9f5df691f458dc29947e72bdec1da18d24c4db622ed5f5aeba457b066
196 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML flagging further supports its malicious nature. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of using password-protected archives to bypass gateway scanning, though no explicit password instructions were found in the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5288ab8151---kofelatefir.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c260259d46---36811870172.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b07c7162dae---6479631009.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/61475262357.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8ba572cd2b15d1c99787ea9687b78f38/lodevasesenejojir.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5382964df5fce518dea5080a7d456564/xusugomawuwobojizivewafe.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7c3a97d6---68312018331.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/vefutitobovuso.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d8cf3da0beec96862e1108398edc1f11/kapifevobimeditipinos.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/od0n81s2pja5k48oud3g6sel16/6283433466.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ei8hp2anic3u8lovf2kajl03h2/rixagojup.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089628cd70cb---xiviwisirizebopuke.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2dmibtkd100ddhl6elvuhc2qmh/49759797637.pdfIn PDF document text
    • https://kham.vn/userfiles/file/samoxexipaliwevodoki.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/77464102447.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ae4ba1d7---vufezazekubirek.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/41253238380.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2hblvcuuln10se9f6f3jshbvr3/xanivos.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e707aba77976bc537748d55ae895f2c5/21088199631.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/kepizovowafoxodomosad.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862ae8c1c4a---rasoxizegiw.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bubibefokokof.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b448549a4---90375253400.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/rezoresajapasufedu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a39888657d8---83736978664.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_071221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=topics+for+sociology+projectPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 10596 bytes
SHA-256: 0db99fad5b6728a191394cf5b5459e7bd0e7ba594b28c1267776ede6fc619ff8
font_01_sfnt_off00013924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13924 17448 bytes
SHA-256: 8250543476039a825bc16f54dc6bd12d22a2e221b547683d49baa8236c582caa
font_02_sfnt_off00016734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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