Malicious PDF — malware analysis report

Static analysis result for SHA-256 d845da0c22b26ccc…

MALICIOUS

PDF

101.8 KB Created: 2021-08-01 13:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93a207ec04445d848b6812277ef54fd0 SHA-1: c0b33aca6c20bb8613b6c7e34d738ad8cd9762e4 SHA-256: d845da0c22b26ccc9556fbea1f8c94ddd3559b2d867f923cf3bacb8fe30b9fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/bovunaxinifupilonodeve.pdf In PDF document text
    • https://5udua.com/contents//files/jitorakuwupuzigutojanapo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9ff7c204806efb4db824825042e34663/dodezuremesekuro.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/41499305102.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/82234921694.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/nufagofuvirurivizom.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qmserf8tspcajupvvn8l7s4084/75997511671.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3le6ctt3f859911gojabgm2rg3/rinejitamofok.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/ninukel.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e383444590---bojokejabixogo.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/tagabusemulipolikigo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091bab29d9be---puwosezafeximojavanokos.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/79687375272.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/52551930975.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/39087087332.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/39600431948.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e1cd5e74b68bed4d7b47f4e054a35f31/84951138181.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/927f127afa383b4609c1535142ff566f/duxodegabovusividogudep.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/57831540192.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/v1rmq7sr7oj84186m5jcnvdgp7/47730361142.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/mezizafo.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/00dc87aba60b7fd7c0ae05c5d11945cc/butesuremibusonakumonibor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=attack+on+titan+eren+first+transformation+full+episodePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 9776 bytes
SHA-256: b8240394fac811c1bdde9ec9c492a5d485b5dcf1b6a5ff8b37bb4cc37586f6cb
font_01_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 10952 bytes
SHA-256: 83af1f7e344ab442234fdc236c2bb2b9097f0eec331f2d266071b0162f87d9a2
font_02_sfnt_off000143a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A1 16968 bytes
SHA-256: afe09ca31bfdfdad4a9103ab71308487e5eb9763f3f1cd2a9a603ff547fcf0e3
font_03_sfnt_off00016f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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