Malicious PDF — malware analysis report

Static analysis result for SHA-256 699f80ee314806f3…

MALICIOUS

PDF

99.8 KB Created: 2021-08-01 04:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2656a3fc53e2e4ff0d8cf10fabb255d0 SHA-1: 366ca194a45f3fb274c9fa2e7bcd012b0070355e SHA-256: 699f80ee314806f393d945d2347e5341200f90c1abb179ccea68a89ee8870a3c
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to create a network of links for SEO manipulation or to host malicious content, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://heyumpnd.com/userfiles/file///torutaligubesel.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21b1d8710e---24079195096.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/v3hs84socuq2i570svi073vdgg/36951709351.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81b653bef---zovamideviwasujirinalu.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/1716098167.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/jinerubarigijereku.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f26272119---jidavimizepemexepizogepem.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/vapikuzoxideluwudaxitezu.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/u68d5r474jtnl8al20lktrp734/fotuputetotanuxapax.pdfIn PDF document text
    • http://rilta.net/userfiles/files/zesepagiposopogokiwaj.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/lumalemurizadugido.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/83692968876.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/kphcic95tn2r9pv02crfhgpa2m/fazotiwofuwufuzeli.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/buvila.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/27290476794.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/35218679937.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/modiredurak.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/45707189732.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b14334fce2---gemofegezomafep.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/abdd8b83573a91c32d9df4a582d379d6/tabivijebamupiniwus.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/gerojetudamamade.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/60347218447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+reset+the+change+filter+light+on+my+samsung+refrigeratorPDF 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_off00011733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 20504 bytes
SHA-256: 25d148dde4ca49fc7ba4210c76b1baf956771fb87fa05b76f02e0c4354a21028
font_01_sfnt_off00014c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1A 11212 bytes
SHA-256: ef48645bf55c2fda4841b0cd7b0274d53b7a43fb4f946d5c7fb64c6976ba36be
font_02_sfnt_off000165fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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