Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b33807539aca7a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 03:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f927592cb0b26d5724f161516d641eb1 SHA-1: 892fd4222cd55ab4a24a387d7dc6e98c7aeecfdc SHA-256: 94b33807539aca7a566a794bd8f5be33a3e89e93536ddeaecb014cd4dd5e8f10
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is to host malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coinproject.com/userfiles/image/file/94580889919.pdf In PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/sasexinanigumizu.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/90953556264.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tawefebegolipenifapimab.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136754d8fccc---38024640057.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/35324305362.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/12218224129.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/006f46c1234cf997c82508a75c44f370/vabijidiwim.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/sifemaxopisa.pdfIn PDF document text
    • https://italvaping.com/file/rofubipatarovese.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/62552624041.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gozipesavojomarawirezusol.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/kijezemolufufej.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/vibitaxapudonetenadasafi.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/wojudefarejomozimusijewa.pdfIn PDF document text
    • http://landpas.pl/upload/file/wovaruniwexibapusire.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/011cj8vd09clajgoo0i7pueip1/simidedujevesujolibepifuf.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/dawemorakosazo.pdfIn PDF document text
    • http://zerosquareonline.com/file/88214831631.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/45092419012.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/73977823512.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907022127657053.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/168039091461334ac25d95e.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/3274479684.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613751164d944---madedanenemawopiga.pdfIn PDF document text
    • https://shunnasato.com/xemigevinarulozup.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t8p56hrjquqrmi2jag8cnmkc9j/bevisomukazumodit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+transfer+things+from+phone+to+sd+cardPDF 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_off0000ce2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 17868 bytes
SHA-256: 5b6950b4bcd64edf359ab7d0a1721a9863feedb029cca5f64f43a0983a705711
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 11096 bytes
SHA-256: 5ce89ba0487849aca2214abe2ccd98b06f4d25de4e3060209a3eb09010f7ba2c
font_02_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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