Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a95754b54e9f8ed…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 07:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c94bfa2b34dc6e2427bd406386a9e3a SHA-1: 95927a5ddf5f89cea59ed6ab2ff470825bb15389 SHA-256: 9a95754b54e9f8ed93224cec009c2a1397a38f70210650704f1e2c3b68010313
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 a high likelihood of malicious intent. The document contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=cara+membuka+android+yang+terkunci+pola PDF link annotation
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/gilagiladij.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/92945309005.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/jabemif.pdfIn PDF document text
    • https://blogsma.com/files/xigixajilonofezobifus.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/85128454775.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/xixiseteleb.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/nuxaxigolonobujemimuwiwi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161342a4946ba1---kibedirabogil.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6f6b2c1fbe032867e6b1c43203c3474d/70931611701.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324a6ade37a---sixopizevulowut.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/lidegewamifajoxudaz.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/49071133780.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nuruwebapa.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/korisi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613adfaab6251---4577857522.pdfIn PDF document text
    • https://beautydent.hu/editor_up/jupunepurelorun.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/34968983570.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/legadegisasoda.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/82609015197.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/lejujipaxularajolukor.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161335f0da786b---33614197541.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/xanekevomemib.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/kobuxava.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_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 11168 bytes
SHA-256: 59535dd50b4d580bb819144987dc38224f5970d1aec3f1d2e71297a3bbebe018
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 16392 bytes
SHA-256: 836a160407e2a3dd483cc8c94f356bea9c16fce32fdcdbe2692a7061468c669c

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