Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ca82e809078d6c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 11:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 630495994132fc8c3dac96a13766b32f SHA-1: ba79e050611d92296cb50fc43edcc5751f4b5175 SHA-256: c2ca82e809078d6c40692b994382250e0839e43dc533aa06c67ad4a91e00dd9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. The primary attack pattern involves luring users to click these links, which likely leads to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://teacherandtraining.com/coj_u/KK/userfiles/files/64012982482.pdf In PDF document text
    • http://smartvoicecom.com/userfiles/diburebujozilosipepala.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/jisogudufij.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/meceusaa6ehq36ji9ic9f41sk0/69378555031.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/68140262010.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/xemenumilamonopi.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82947374587.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/45508141867.pdfIn PDF document text
    • https://tisuputih.com/contents/files/piseboruzejupixetat.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/84369281324.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d628d46a9---35028336227.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/rakipumelimipoxajaxu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6b3cb3e84a127537a640b8bade20cef7/47946139343.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/pakos.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/rudajesubana.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea52765a08---55242781261.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e7cc084445b99213ae5e957589306c36/koxubiwedofijutaluwir.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/5h9bmqmae1mucepb2d7armiq5u/93315547635.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/bomaluzafufosefetojo.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/wopesodetulu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608701930c550---tesasinoruvubus.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/sunevi.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/gefonapunof.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1624394580454.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/litonukinodi.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/vbibkdl8ali3gk2pb5ar5aejtj/47425513615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=split+range+control+valve+pdfPDF 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_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 17004 bytes
SHA-256: b4cb060e206da5034171879786606362c0607382dd083f6380e6b4c20dca0f92
font_02_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 10768 bytes
SHA-256: 100b8ebbfa298e53dd67c627030e0b474d5cc6281a3441f15d0201db09568129

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