Malicious PDF — malware analysis report

Static analysis result for SHA-256 c432eb61416e29b3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 09:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cc47081d20652f7b7029f02a5c5f45f SHA-1: 0d5abe93e957aa1ec7c05ea359b6cca62581b2fd SHA-256: c432eb61416e29b393444b7afd3fcc8914139a4a44fe92d7f5c8544f9ac9cd55
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 it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to obscure the final destination and evade detection. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://ekselantechnology.solutions/ckfinder/userfiles/files/rozusotig.pdf In PDF document text
    • https://valenciamaids.com/userfiles/files/rakajonododato.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/43159458236.pdfIn PDF document text
    • https://duel.pl/userfiles/file/93384810597.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a74092e7---99973768365.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/nojuvemudim.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/11623151982.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/81410976544.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/savunusokebufada.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/99690622999.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/papur.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fab867b0---zinusiloba.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/70388291509.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/zikosevibosagakejotov.pdfIn PDF document text
    • https://gmt.twwebmarket.com/ckfinder/userfiles/files/76617052679.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/zenopatuzukawedelorobuxuz.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ab795c1a56894f76489a4f4e59c062e/8292441405.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/83799613272.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/7894382577.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/33349295316.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/dejumuxorew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mr+autofire+mod+apkPDF 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_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 10524 bytes
SHA-256: 972bc46185861a8cad06115a59d2f298e2c5be03625d6be4820aafefef1a9574
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 17248 bytes
SHA-256: e7ef134a5fc62d2a55fe88415e6f48a1d8158d24403c328b5c72b1cdad7b6b1c
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1