Malicious PDF — malware analysis report

Static analysis result for SHA-256 f581b27216d16da5…

MALICIOUS

PDF

90.7 KB Created: 2021-07-17 04:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0a4c45bce0c20231d54942c1a6aed878 SHA-1: a0870f0f82ca5fc471c561255229227edca971c4 SHA-256: f581b27216d16da5a4363f9ea8aabcba7adc9b61284c6bd19e7eaacd9a24bb1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, likely intended to lure users into downloading further malicious content or visiting phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8143c0580f---23694509794.pdf In PDF document text
    • http://aj-logistics.com/stock/userfiles/file/jibirabunakikerukeziden.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/5c8e751264e894379bcc415d032c4a1d/wixoneges.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/70334348287.pdfIn PDF document text
    • http://donghotam.com/luutru/files/fexeguvifiw.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dfp0bb2feef6pohh3rvtvv3ge2/rupagupivepipamuje.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/b7m6heudq8ap1tlmdpnm2k49ik/13356549638.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7d7046b1---foripezabodolazaregavedix.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/76739939910.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/32631053357.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160710e4b2124d---95055482578.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/fomibitogevawivizu.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/7266e208f383e705868172602ee7e010/pomikovomab.pdfIn PDF document text
    • http://canvangdientu.com/images/file/93569887862.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/19054536890.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28634d7be---41023685502.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/adca139ef41dd3eeb9746776f80a9adc/gaguganovimafelojud.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42b708481---21199024852.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/54494fe507d200891df27719cf75fb2e/betavupisinutipedome.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/03f87f83ab473a8dffbda6eb64a93b78/gomarelilivopovumidebewi.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/makukinotadopikilez.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/61155762262.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b419cdd2---89630219823.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/69842604899.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/24163008580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=powerpoint+quote+slide+templatePDF 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_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 17032 bytes
SHA-256: 5f3a5e9c44c7d94b9e9a603402c5d6923b5eac34536349f9de92bfea40d16a51
font_02_sfnt_off0001444d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444D 10888 bytes
SHA-256: f5b81792b584d6936b8c691fae99fec494872c7ebc2d5df04dcf925f622a0b86

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