Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a85bb2171472217…

MALICIOUS

PDF

84.2 KB Created: 2021-08-15 15:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 037e158ea80c41832c313241578a31a7 SHA-1: 9faaafeefab71652d81a1a7d68d610c46678e680 SHA-256: 3a85bb2171472217614d79ca4a890af0e7e0e66c1e9396ed2e5f76d144641fcc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or redirection attempt to deliver malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns that leverage link farms to distribute malware. No scripts were extracted, but the presence of multiple compromised upload links points to a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://amrapalispot.com/userfiles/file/bunuxifan.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4edc2fb8---28781328920.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/bozajodubik.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/xotidokuxaninobubiwasad.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/39651167473.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ls0r8k6ffupq6et1m32osjv79e/dufopin.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a671ecf59---78416803453.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b45d3bd46ddae2edc2b3c8142cdaeea3/46896674891.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5ac033fdc7fe7299ad6bf1213b4db1ca/savexotevunizawonulitavu.pdfIn PDF document text
    • https://btegypt.com/file/8978615643.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607057149286b---luribujubapaduzikaxaxi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dve7tunf06r1p1bt4pcuhafpbp/56368585485.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb9986876---82799885275.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/l41c8qg00f5jh274prglau3vh5/zupiripokukejo.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/45b6ca39ba3f5452e124974b71bc8b69/27258474489.pdfIn PDF document text
    • http://vnplastic.net/upload/files/51781871704.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/vetalazikagagubotopodubiw.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/93036631268.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/mizizitovom.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/dibaxelonidawulu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd46d768ca---59677492145.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b27f7fdaa29---puximadofitinufanajaxag.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/wezizoj.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/46003368351.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085d1ed309bc---fagideleromu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//rofusatomopevujit.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4fada1a2a---safazaronigekumanolegetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+you+name+a+plane+in+geometryPDF 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_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 10716 bytes
SHA-256: 39e212a4878e741f2505c28b12c80aee66012431ca6dfa57c7a3c645607e1fc0
font_01_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 17264 bytes
SHA-256: 96482024558015073ea395f887f02981d34663cebef7dc76d24dca109d596994
font_02_sfnt_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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