Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac16f2a260415a5…

MALICIOUS

PDF

109.7 KB Created: 2021-07-14 00:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 59b0a14795f7bf4031da9feeee668144 SHA-1: d2072440aa932c26a0df10320c32fe85c4dbfc68 SHA-256: 5ac16f2a260415a5feee6fd0c1639c1b5aad6e5ac636068af221129952bc0666
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The primary function appears to be redirecting users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://crysiq.ru/uplcv?utm_term=all+purpose+flour+meaning PDF link annotation
    • http://nkland.org/userfiles/files/jikukaniguv.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/5777544852.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/lakozupebanutimetinesipe.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/sevujaxi.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/rojone.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/minetiziwukolakejexo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df10610a7c4---50981172155.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/70016225981.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9882365f---42076635489.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d46d8644.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/bts9n3mchm3m9ier70udopabqc/50602919676.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5sjn3obofti4o66gc0a6ruggu5/38543062176.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607951ca7c819---tikizopupigunotid.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/81921213931.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fea7d917d---duzulimikifewaja.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rqk9rc05usv0gkgje3193gbib9/vufopefixijolepa.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/91890788261.pdfIn PDF document text
    • https://bloomeng.com/uploads/patupif.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6e13d9d9c42e9f9ac049f3cdb62c1a51/jumox.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/94507452421.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/xidonanugopinam.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b34b6fe0d32---rijomolim.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/84161264834.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b964047cd---5266889626.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/50837466304.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001360b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 4592 bytes
SHA-256: cc24a27607c2bd3e4e0e91172a1a241d148b02926e73d08bf096902768b4a006
font_01_sfnt_off000146af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AF 19528 bytes
SHA-256: 42516936b4e3269852c281cd108c273d3bc0b9ae815d1d2ebeccbbf7f9c3e6d7
font_02_sfnt_off00017871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17871 10684 bytes
SHA-256: 6b10bc8e8ec05dfa16bf504e134896f92b3e017182619f9a5357a06f87577839
font_03_sfnt_off000190f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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