Malicious PDF — malware analysis report

Static analysis result for SHA-256 834d27c0f94343b0…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 20:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ba4867460d6fbd1cc834e5c8f2c12e6 SHA-1: 828984928850d3a0ffd869cecbee5aecf04503df SHA-256: 834d27c0f94343b0a9574f20e55dc3862e2a51adcd62aba63d6c1410294625a5
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Remote-support tool lure' heuristic indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for tricking users into granting access for malware installation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://crysiq.ru/uplcv?utm_term=bitdefender+live+cd+manual+update PDF link annotation
    • http://www.ags-sib.ru/ckfinder/userfiles/files/lepokow.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16103f7dd5b019---14896664350.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/kovasekiwixuwava.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/74617599134.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/87752860942.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3e741782---47267611690.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd238d7921---28291384970.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/neweje.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8502c679c1---24566581587.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/19448142533.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608487a21e899---tisegululaz.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/78638280453.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/flq6v91brdvrt16roi6lvrl7l3/zagezalunore.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/mefivulotitezubilaba.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072155e70a0d---jiduzukato.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb66333dc2---34448260962.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/83556616710.pdfIn PDF document text
    • http://iphysiology.ru/upload/40742399576.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/63454126747.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/56322161314.pdfIn PDF document text
    • https://areicon.com/images/file/zefovozupevulenudedodunon.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/xesafuxejevi.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20e3db00c---venabomaxutigamifara.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/s1m8rh37h5s2ho8j0nequfdpql/51645851827.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 10712 bytes
SHA-256: c0c6bd45d209db991cfe3b159b10fb3608d93bcaf93c5e1108a297df78cb2040
font_01_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 18068 bytes
SHA-256: 95fcfde14270c28c44433fda5981f2aa9bd040a0bcf2acd46a7228009c60b0cf
font_02_sfnt_off00015175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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