Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad866fc6316f882…

MALICIOUS

PDF

91.4 KB Created: 2021-07-02 02:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95615f0624756b131ef27f5a55e61ab1 SHA-1: e282be9a4889a1f943832775602777dfa035fd3a SHA-256: 6ad866fc6316f8824c3bffe6f0b68ebab80bd870b02fd0412df687759622ac97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=daily+spins+coin+master+2020
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/63f89d1794364999f8f1a9beb212760c/mexalexoz.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b7308d3cfdd240d351a9066c14b25f41/kexite.pdf
    • https://imagebeaute.fr/userfiles/file/bavamilinofivuxinazu.pdf
    • http://standardamulet.com/files/files/82274294429.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a25e58e4e1f2befee5491b49b65803f2/mapinaguzamumiguripevupod.pdf
    • http://qtjdb.com/UploadFile/2021/06/12/file/20210612_182637_167.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/67628878580.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2a5a8042be11270e7060b2dd37099210/vixezajufifaz.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c005ca26aab737ec20dcbd4007b8a49e/salugenate.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u37bceqv6u2hdphk8e5guo13e6/kezewotenofaxud.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/abgnik14dgvl91dact9ov23fv0/nukizinulezobobogu.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8d7b0e6f---73315475207.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbfe21a388---60189816349.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/5a3a7911e2f601746db071913d903a62/97998048057.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50bcf151c---56281831566.pdf
    • https://grupo-kayros.com/userfiles/file/wexogiresukugi.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094366c7a231---82854110484.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/t19s5jvmceaut4im0tak87ique/gaserisir.pdf
    • http://jyjwqj.com/uploadfile/file///2021062921585690.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/d6eci3n0dbvdjvea55mt285pfb/31712852317.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/fa697342fcc929dcad008160e4d081e3/5477855299.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/8m4te0cn5262t0ii2g4rb0erun/nuniforipidopi.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710442393e3---saboxafadapazanumekir.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ef0f0661292f4234e7874e385bfa77d8/6433378606.pdf
    • http://esthebel.de/userfiles/file/21044570749.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020a.bin
161e496f2540800475d4b6167dbd3c9ac8fe6259465fc45fff3a63bdc7565c3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 16748 bytes
font_01_sfnt_off00012d93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 16792 bytes
font_02_sfnt_off000145aa.bin
cdaa8c5b645d77c28d274a1764f3d5b0b17aa5f5680df250a3c309b592a02a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x145AA 10892 bytes