Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77dbff8960016d7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 03:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1326961c855774f53576f5a06571433f SHA-1: d4b06a5347ef49c3769501016bdddba782b972c8 SHA-256: c77dbff8960016d7cca0c576dc5bd8a09fd2d283609602dd3b3a4263af1451e7
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=guitartuna+free+download PDF link annotation
    • http://sake2metustin.com/uploads/files/46477392383.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/nanokede.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/malufurovegunidaz.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/redufelaxiruwikake.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/63982142687.pdfIn PDF document text
    • https://casaalu.com/luutru/files/85096788229.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/biguzikififomunidagugire.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210913_221615.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144121e2435a---59718805176.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/xugobonunivoke.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/061be6b7e8b4e813286f860c0c7076af/tifodokebasatamoviseg.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136024e585c8---63708159388.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/34217564825.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143186698962---roganizuwixujup.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/jeniveresusazemukuxepeni.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/tidazateditubogaduzopile.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/92791712595.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/71995622302.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/gebudozalibikufubega.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/bafakamukizotivotorazag.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/tomutuxeronulibelodepige.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac44c424bd---ruriwenukimatupidapefog.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/3679569619.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/lekadanotigukom.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/92122899783.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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 17852 bytes
SHA-256: 5cdc5b75b6ff1e948e0dfb24dcc96dc292a7a83506da5611880d9e151ef8a2ca
font_02_sfnt_off00012239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 10404 bytes
SHA-256: bc36211f1a7b01342030cfba76d10291a73f662151a40c56d0437dafc81d0819

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