Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2fc3ed841fd908…

MALICIOUS

PDF

86.3 KB Created: 2021-07-07 17:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad9492fb07fd0a012d06270800ac4383 SHA-1: aabbf4e80ec43ac91ae96dac4dd66ee48aa06f53 SHA-256: ff2fc3ed841fd908679e63d0141790e8afd37ce1be9c34ac4339c415f0e586dc
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a malicious intent to distribute malicious content or phish credentials through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pistant.ru/uplcv?utm_term=chatsworth+house+website PDF link annotation
    • http://aucoindeshalles.fr/menu/file/20443360764.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/98788765756.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b304d8d5b5d---16654121434.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4nq7mgkiolkqg9hjjkbr0heg07/51134322707.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b96d1875---beruvirikogugaze.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/pizedabixos.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/36422177893.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/4154671325.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/81112071887.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ac16a458cdfa43c7c200bb94de77ebc0/lekulokovum.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/c3tqnqgah4u0o3nciqefio57lp/54043628461.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jenipupegotolaxesaji.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/7097c20c42c27c0098f0d2af211cf365/leturolikiwutalagexumus.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/nkds5ici0r9htlghq525c1k6bn/10743169754.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e087ff024f6---69366398690.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e581c0950fe3cfbd1c561a7bb0e201cf/jutirinajipi.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/66394724834.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/bitadodutukawuzo.pdfIn PDF document text
    • https://blogsma.com/files/81523225744.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7e4819c1fadafec9ecdb2e3558a2a1a3/gegaravupowub.pdfIn PDF document text
    • https://digireg.dk/upload/58983927720.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4cs0eg8lan2he9uf8hvia6ai7i/57734598874.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4784c61ee4d09ad92316eb19755fa866/zogepekemeluvasagesu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/078d3752373174b03de539ed293ad6f2/viwanakanakijipuwuv.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/411bc05b77648fccee0e54fa94bb0c89/74935544881.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/32f8cab7c063c393a44e3273e1d38417/tofelajofat.pdfIn PDF document text
    • http://amajyuku.com/files/files/jujusalunakikipe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 17512 bytes
SHA-256: 7ea468c5abde07eb1146164da8d487c41006f465d1f38c281440ab5eeba5110f
font_01_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A6 10412 bytes
SHA-256: 29e285e56eab9a72a9295ca189a99695be709b7536521b3495fa36d268188e39

Open this report in the interactive analyzer, or submit your own file for analysis.