Malicious PDF — malware analysis report

Static analysis result for SHA-256 f628998e1d80175d…

MALICIOUS

PDF

95.0 KB Created: 2021-07-08 11:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b827a04ace579995062c81b2a189f838 SHA-1: 61a220fe40713641e4ed0a3da9ee8da35fa6f0e6 SHA-256: f628998e1d80175d54cf18234db0800f248628556f5f1c010e13cc4e7771753b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The embedded URLs suggest an attempt to lure users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa36e09ceb---saralavadokebula.pdf
    • https://oklogistic.lv/upload/file/43064464438.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3a1c0ff4cf898dd67a2ceebde2919f40/wekuxupunizolifuzil.pdf
    • http://rolmech-strzelno.pl/Upload/file/teberu.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c649d8bb2---62697074543.pdf
    • http://sosnovgeo.ru/userfiles/file/pawositilamuwuwiga.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/0tg9ntmm4sp92fhjr8908q9jc0/28652756860.pdf
    • http://sattamatkapatti.com/userfiles/file/zenoseduluvawitejudopa.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6c24010a---xodabenuvutaziz.pdf
    • http://vyveva.eu/UserFiles/File/kukuraputafegiw.pdf
    • http://altaprecision.com/userfiles/file/80270793874.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1b60125c6---4885867596.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28bc235dc---dozaxesikamevojazew.pdf
    • http://bidmitt.com/img/files/file/41979026259.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf07306b8---pusutuzedesuro.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e513e2af70---befobowurapasawukiferi.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/74879980897.pdf
    • http://igorodstore.ru/files/userfiles/files/74616723110.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd688bd174---66565824339.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160701bd568c06---80156646907.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c5446ef3d7b313c1ee85cc065de9239c/pidoru.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/godibavaj.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/62214773615.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=britney+spears+and+paparazzi
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f7.bin
e6cd4e0057bfffbb53f680431f96c5e48a85e2f531756a647907bf9b2f643bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 16756 bytes
font_01_sfnt_off00010e5f.bin
aed92637e8bf21798823b34f3fd2d60a2085dc8f3330150cb0039fb427b7883e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 10448 bytes
font_02_sfnt_off00012645.bin
7dad7611e441e3a78b83d4db3337ca6994fa16ba61cc6df16bb27a2d87453ff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 18152 bytes
font_03_sfnt_off000155fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x155FD 16792 bytes