Malicious PDF — malware analysis report

Static analysis result for SHA-256 49894e8ff43a9b0c…

MALICIOUS

PDF

74.4 KB Created: 2021-07-02 06:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 118e8fdc244487f21da4e07f2308da56 SHA-1: 09f718e238353c0a35253ef777513052bea5302c SHA-256: 49894e8ff43a9b0c0cbe5680e77d3946e968331fab6a8309b413621f922811af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kxnjl.com/userfiles/files/43684843907.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2f4debfc177fe676773d7efa30b6c86c/zuvapetuxid.pdf
    • http://dr-onesrl.com/userfiles/files/domiw.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5e41e4e7---tizusetef.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f874378390a0d8c8862e4945b35b4632/xifimeke.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/5c3311cb26882cd4702855b261aac495/36697111662.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/evs09eaq26e95mp2257g26sr34/daxixukulupesizodo.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/tabavirebogogatizosomubo.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jc32hkfi1pcvg00o2rt98kg4ee/pemolefavuginegenomulek.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/nco6m6u3itf265un6jpp4r3t2p/57028438642.pdf
    • https://esperanzadeavila.com/fotos/file/zisivaragenefut.pdf
    • http://ottotech.center/userfiles/file/34724373520.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3vnsohbj00jab59u3odbua2kk9/dexelidogij.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609308b004bd2---rowumexekeja.pdf
    • http://promocode.lu/userfiles/files/11347566860.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1kusetv2l4e084p5md91ah9s86/rerale.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083535a16b33---wipipitepoxazati.pdf
    • http://noithattamphuong.com/upload/files/safelejokorivukepup.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/406e782c011709b29e624e7e7d9bf84e/filavavarujuguka.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1c9deaeed18edf4c87f00844dd4855f9/70011036098.pdf
    • http://techscreening.com/userfiles/files/98077248688.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc888f98b8e---94388694193.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/73f447a2fdedebd30fae7d34e1b4d404/pifilato.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pjesd4158l87vda5c67n38v5l3/ginofidika.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=near+by+homeopathic+clinic
    • 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_off0000c2fa.bin
7bca66430a8dd6f6aeb1a808543f0158fb680c8bc4d9f4f97951b22f7fca150e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FA 16116 bytes
font_01_sfnt_off0000ec4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 16792 bytes
font_02_sfnt_off00010461.bin
34cdc31def3c73a4f681a63f36178961abde46157242532c399dcdd6de409146
pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 10700 bytes