Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc86fccda4b42c0…

MALICIOUS

PDF

91.0 KB Created: 2021-07-04 23:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96a5707d6617f4a278ad03c81ba3e239 SHA-1: 0e6fd92d86db40cfa375cfce8d60b0cbedcc5fa9 SHA-256: 8fc86fccda4b42c070e7393e08ce7c08c58ae9beb2eec46013dab06a8138988a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external resources. Several of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting a tactic to obscure the true destination or leverage potentially malicious content. The presence of these links strongly suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://truhlarstvisollner.cz/data/file/mejopuloseb.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d937cb969c---50438289184.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1kva8lh5k33e455jk71sfkesru/nipufizavo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b8955842---dijedojupiloli.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/70623705666.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e713d39688---10402834851.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/e71jemtubrovb8ra5i356p8ipt/gokesepatog.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/66794897416.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/31932648442.pdfIn PDF document text
    • http://teraval.cz/res/file/17778867345.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/66885345752.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f91eaa462---zitifarimupebeseni.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/kulejurizikiririjokatomud.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e5afcbb4abb7628790acad00ba2b31b6/35144800623.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89cfdc07c---senavo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef5739490---480593598.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2e126994c99291c592f7b0c854eab516/91532038430.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210601211931.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/jokunuvaxirogibukaduz.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16229990311150641571.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/cfa79c8fbd4debb37f6bfc47fb57f0e7/87723211253.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c954c1377d---ridomuzuje.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-10/20210610120407360929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mcq+test+on+india+size+and+location+class+9PDF 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_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 17776 bytes
SHA-256: 4a4bf1c965b75c96aef4e85d749fc0fde5e075b42b4564f65916d3234b1f6453
font_01_sfnt_off00012c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 10632 bytes
SHA-256: df1c1d4964e70d3b4f8bb5a878f40cbfc0951daad606cbda5771264909d3f2ce
font_02_sfnt_off000144da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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