Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c1b21123117f12…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 18:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69f42993c3863501c0f38f77b587f1f0 SHA-1: cdae1062ccdac0d3b21dc1916415f6c9fe74ed3d SHA-256: 02c1b21123117f127096c377ac57702362bb3e586551e188644cdb5cb8b08064
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the linked domains point towards a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=3ds+roms+download+for+android PDF link annotation
    • http://schturman.ru/files/files/46350577609.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/53788363584.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/70386816501.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136702d623bf---jexokegopoti.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/80942138715.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/50784979246.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e19c921d---fojigizilokive.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-10-10-23-05-87.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/47064872995.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/bosinepep.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/merexel.pdfIn PDF document text
    • https://activepymes.com/pub/file/75685740776.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a79fec42a---59996849580.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/16963622359.pdfIn PDF document text
    • https://chp-travel.ir/data/file/3900778749.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/79622282503.pdfIn PDF document text
    • https://ocw.tw/uploads/files/renukinuvarotetapofisol.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/4308196139.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/relajuferav.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zikulolu.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/47436044140.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/tesafik.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/50510112203.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/wefanobev.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/35994642644.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_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 10448 bytes
SHA-256: bea64ece73dc7bc84ec4790d2eecf932bb3c5c6b0351aa18e0c2b918d3a599e8
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 17200 bytes
SHA-256: 1bb4f85bdedeb22b3a63d0ce6f644d43225b1aebcdebef64300bc7bfcc7bf75f
font_02_sfnt_off00011b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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