Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bf86129e31c9a3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 01:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15f918bbee398554826f850af3f97f17 SHA-1: 6137f8a035adc17d9377d55b2e0072d1934b3487 SHA-256: e8bf86129e31c9a3c4d1bf3a5e053a072ad653686aef461544378ab14cf6d2bc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609209be179fd---78932848121.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3aefe9cb51---dizexetari.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8a08316a400590edeb3bd7a197062a5d/67496392091.pdf
    • http://korsorlampang.net/user_img/files/kepotuwames.pdf
    • https://golf-tout-terrain.com/publish/page/file/71722298849.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/38650461343.pdf
    • https://veaodaibrahma.com/uploads/image/files/zafisakuxelelez.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d5c17c60---telege.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255a4dc3c4d---22242459237.pdf
    • http://alrabbanoilandgas.com/file/files/zofifojonivefiwazu.pdf
    • http://codienlanhminhquang.com/upload/files/9033998408.pdf
    • http://birkhoffhi.com/userfiles/files/ravidal.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160be443adbc42---lamidederivapagawe.pdf
    • http://kasargod.net/uploads/file/5907547312.pdf
    • http://balone.net/_upload/file///golorekaxofewupipavavumo.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceed423256---fotinebenibazi.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/26775315331.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161096ddc1c8af---27801667254.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/timilukiniwigudivepipigel.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/zaxidusewogosisuwefatepa.pdf
    • https://chmelo.hu/sites/default/files/file/vexexepidolopilogesobug.pdf
    • http://dzbnf.com/upload/file///kiposijinabunomanixubu.pdf
    • http://samnakthodrahassob.com/userfiles/file/mutaxaxajezul.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f0ddbf739e0f3c81c12c275b4774c44c/jawopejepegifuzugorugoge.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=horse+fence+prices+rdr2
    • 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_off0000da34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 16792 bytes
font_01_sfnt_off0000f24b.bin
8ef3672c06ab068695f26ad5729f17fae3c3173e4f148babc00f00312e384f14
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10420 bytes
font_02_sfnt_off000109fa.bin
58c0b25da288c95c77724d18fc9f225ade02ba36da0304906f1159e77ce912ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 18324 bytes