Malicious PDF — malware analysis report

Static analysis result for SHA-256 4388bd86c41e0542…

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 06:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce243fb8120a2d4e3a177254a329dbd3 SHA-1: 9d2c49ab23db9b71e5456dc8ba14d6ce72eeb7f7 SHA-256: 4388bd86c41e05422d9aa0a4038a2e5747c00dbde4422ec8ef75066c6b2f57fe
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=guddan+tumse+na+ho+payega+episode+100 PDF link annotation
    • https://arerp.kr/data/file///farubigosobetin.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4e642c009---medemazur.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/gekuno.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f033ae7d---50038696941.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/18b16af16c170589e1da34e929447f07/fazexafeguzame.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/sagud.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e3555ef6942822fb1d35bc676ac82438/89558193.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/weser.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/140e233dfb6179c032835274ec6aff21/xotarapudufarelitapi.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2f42d085---35354727391.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b19682291e52314566d0d8a09a768a53/75379066682.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/85968649368.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb89d4959bc---puwivuxewikotorisidaf.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/juxavuzanufixofufojuganu.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/fonidefosuta.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de85d423e89---48730197577.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13ce698a1c---gevesumosisowatad.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/gekujojotuka.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/57898160058.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2fdeea3a2---56388533352.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160769e8d2e65c---waxifamatixurejowepafalat.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/doderizujugalifuvujupaw.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d2470756---widezowoxumonidupute.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/eeaff4d15ef43cef0cadf21fc53b5f37/95476559542.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/d12e8885ceb4db91556a93490eca3daf/jiraku.pdfIn PDF document text
    • 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_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 16572 bytes
SHA-256: 073369c58a3fdc226a895d12f5ca95631eaea89469f7a2f54218c90694af764c
font_02_sfnt_off000141a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A2 11120 bytes
SHA-256: 2437ca9708380aa3d603e6b78947154805f2b0f06c5b787515e8418ca7312dea

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