Malicious PDF — malware analysis report

Static analysis result for SHA-256 4957c0943afe21cc…

MALICIOUS

PDF

75.5 KB Created: 2021-08-30 23:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6ccc2888554f5306ae343c2d4185a24 SHA-1: e8e49b561f79098fc764f716622c50136633a16c SHA-256: 4957c0943afe21ccfad8f520fb4873eb3d35734b01f49c089397b4bce6d81883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm for phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of multiple suspicious URLs points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=up+to+the+task+crossword+clue PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e4c82463efc57e8c4eafcf1eddb4a74e/93605440730.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/aeim3oe687lg9cp1ot1g75m6b1/5868320735.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/mozavinuwuvuworaladuroxa.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/9878452713.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/pepudibugulopaxitimuwoga.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/db23a2ecdf9bca8b21411a16fdfa40d3/62903211964.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/7052903657.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/c4953d8085292f62ece42745e23872e3/tipadivatunolukudavi.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/namoluvob.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/batipilikiforujusojop.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182d8b4fd0---1998475308.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161184b5d84922---fevinusalarotofisafenisu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2c6bf42d7a33fc25430027185f459136/wapavavuwi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803b00c859b---fekosujiwegetamuzisojeder.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ec87da8c7f39afe58b507c75b2cf2049/duwefol.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/8121100829.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/kujukawexeb.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/xafaziwokiniguzutov.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af60b19b730---befeg.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f637af82d---dezesezovavotomawazilej.pdfIn PDF document text
    • https://baglab.pl/galeria/file/sukepamubora.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db611a61f1---1061901091.pdfIn PDF document text
    • http://dentistturkey.com/image/files/tojedijibebibifaragowonup.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/63845965547.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_off0000c52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 16304 bytes
SHA-256: c7c70603035577c2a8f5e153c71495bcefd03e40f98208760f5f1ff39d9acbd6
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 10700 bytes
SHA-256: 58a8ad353ec1e89488bca12f48a1b25dd3f8c8977a7fd8aba4feb658c7355e3d
font_02_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1