Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7cfde1ae1322582…

MALICIOUS

PDF

80.5 KB Created: 2021-06-30 09:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62d3dcc5770b328b1422cf340be4d1ec SHA-1: a820f17bb3fcba68c0e47be43530a80255440867 SHA-256: d7cfde1ae132258201967499457ef5826a8ce956440cffcd8db35a9f2ae9ab17
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's used to redirect users to phishing or malware-hosting pages. The embedded URLs and link farm structure strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://krisoc.ru/uplcv?utm_term=y+and+z+words PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1830775b3d0e034f29b2df65c25cdda2/turejaret.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/kuwusaxebobufidopedetas.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6a76391318fedfa4f34dff57da0c3f99/29611574841.pdfIn PDF document text
    • https://renault-service.com/userfiles/poneravilewudexuwuwuj.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/53pr8m58feep23umlj8cv2lgo0/kosopegoletekiruzimidumo.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b1b20d33396f7332f607da7fbdf00b4a/43983973440.pdfIn PDF document text
    • https://menu2uplus.com/images/file/30091360025.pdfIn PDF document text
    • http://canvangdientu.com/images/file/xetawifuli.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/76367125141.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aff080260---jujugonop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25ef8b2b9---1278635904.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d621eca7a7---14358598468.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804f068ff1a---pimifagof.pdfIn PDF document text
    • https://aashianarealty.com/file/rematujonovipiv.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/59864371284.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6ed794d0ba163220723165912f9ecd00/17701811838.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aa0dfaf852b2586337fe1bb7708b9c09/95227443357.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/sujalikuxuxubibel.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/33219845101.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/61010589853.pdfIn PDF document text
    • https://eventaipei.com/upload/files/65318688837.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/25112fedf8d16322e3023705787d2bbb/melobufasukabizagego.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qihl7ulefcr46brgatm1krnu97/zajimagodabowironanesus.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cdb2d2e1a0667c5c74f27e8a9fb10062/joborikuxexidij.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbcb3a568d---fofuzojewawekegulu.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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 17484 bytes
SHA-256: 2a3a8bf04a3955ff64670dea7ac0d891215e9a868a09071ff3273d4d887d747d
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 10000 bytes
SHA-256: 6cbdae27317556ea8c5d31f526a13401150a9bd9c7c38d67d50babae05d1027d
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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