Malicious PDF — malware analysis report

Static analysis result for SHA-256 97857a8d1e023526…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 00:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9db90c984c924b5cd667b9dc524f392 SHA-1: 32c393d3f08fab373928fcda07a351b39b875889 SHA-256: 97857a8d1e0235260e8435659de9e0229078c5402a92e866f8bca5f5d3b104ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's part of a larger malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://oniceh.ru/uplcv?utm_term=if+i+were+a+bell+guys+and+dolls+lyrics
    • http://travelsi.ru/ckfinder/userfiles/files/2782960636.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-4/20210504013440100496.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cac230511---zowebilogurabudajuvu.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160722a9c9ee06---43082462165.pdf
    • http://2ds-creations.fr/userfiles/file/dokanukiz.pdf
    • http://matsonconstruction.net/userfiles/file/rirotipezowamozukuwesimo.pdf
    • https://jackyrouxmethode.com/userfiles/file/4989411885.pdf
    • https://anmoul.com/userfiles/file/45159157363.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/kexaremigodudamexutenalo.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c351022da0---58047897905.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608575898abc5---16064682980.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2cb2808c4fb4ccf8511ca7575b9a6332/94300130417.pdf
    • http://pkynfe.net/userfiles/file/83940112257.pdf
    • https://yildizwebpaket.com/calisma2/files/uploads/jerixunofewil.pdf
    • http://ackerviewguesthouse.com/userfiles/file/40522034489.pdf
    • http://villabrown.it/userfiles/files/pomaz.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/oihq19d1jns72tf14u2os9ov4j/24648214384.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d11f1c1bf---98858698347.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/rs3omf61kunrr3rgv97vlcoppu/85832662018.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e95a95054ae360e6d4a17aae256935b0/3817058241.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/jometatalawukuxave.pdf
    • http://aklond.com/UploadFilesfile///2021052420470093.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f0.bin
2126bee3e1d569e0a1813edeb0d3c17679ef5c80efddb4db243c254d2f0f5571
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 10944 bytes
font_01_sfnt_off0000ea37.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 1692 bytes
font_02_sfnt_off0000f23a.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 16160 bytes
font_03_sfnt_off000107af.bin
dc09cd30550df91d519061f42ebd2706c5c72e7ef7bf1e874edf270c084a266d
pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 17432 bytes
font_04_sfnt_off00013561.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13561 16792 bytes