Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f77ebef6a9a3065…

MALICIOUS

PDF

80.7 KB Created: 2021-05-13 16:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13783a797282758fc0f773a607fd62f7 SHA-1: 517d973725dba1b0a54b6459c592215eb700254b SHA-256: 2f77ebef6a9a3065fa7c7a17e9d15025e6dee0483cc510b33d98aa68dd24cf64
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, identified as a "link farm" and associated with an advance-fee scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and heuristics suggest the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608330022be18---zapivagipajid.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1b2f3449---sevepovoguzibozipopir.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0c25ca884---wemituraz.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cc6db913---77580159441.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984182123d3---82089106934.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c707c899b845648808919b4db39a51dc/7171736610.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080100d6f501---85247378785.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4d056a30c78126f0b335ed2257de2e3b/domokovizebogelefik.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5a488d6d8f70abb753a31b3bddb2e27/30534687362.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3d7c5f54---xedan.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/21cde784bf6f802720a856ba1bf051a1/13369609777.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/2gclkqfa3n3os861d1iafbre7o/jixuvexewonem.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd58a3039---85280639391.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/588f8512d8e510f3bd0b1263d4145fd7/30778649155.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098e16c41a36---rifijosadesesetajumi.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2bcf73f766c2b9d682c44e508db1c117/valozaparaxunoli.pdf
    • http://highendschmiede.de/highendfiles/file/lipuziselus.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6ak7bkns94l04igi63pgbeg2fs/80181147942.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=molar+ratios+worksheet+answers
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e888.bin
3c1499defb01d70bb2cd1a99f2187e9b55a53790071b73e60527571891b9895c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 6832 bytes
font_01_sfnt_off0000f9d8.bin
85ae09a18cc499d650cc73f4dc7fd759962d52e469dede392df85ca08f7238a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 4720 bytes
font_02_sfnt_off000109df.bin
2d36e5a235cc0832910e2d236a53df5b8b511be120a5cdf16d06e37572cbb59b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 10700 bytes
font_03_sfnt_off00012e61.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E61 4324 bytes

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