Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e11d0260706671…

MALICIOUS

PDF

83.3 KB Created: 2021-07-09 15:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3218432c4aa22c792495613c121b6004 SHA-1: 858d17ddb5b86288f9eb115b876208b7bd2ab1fc SHA-256: 44e11d02607066714be93596c62a7b207695464670cbf1e34e27d0587f0bf13b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories on various domains. These links likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608595e57f708---pujixozozugawi.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe9f6866d---suzexilaxod.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c709d4ce---busunomi.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e0e2a4cf---wuzotofelepiraxikek.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4157852e0---71324404990.pdf
    • http://thegioidahoacuong.com/uploads/image/files/26303119805.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/4fb22118f7b54b5af438564af2c8293b/rosolotesogefenixevuro.pdf
    • http://ats-dz.com/userfiles/file/sujozixogijo.pdf
    • http://thecreditcrisis.net/clients/73966/File/dikorib.pdf
    • http://www.alfapilates.pl/upload/file/9417361510.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/7djq30df84bj9mljf9c2uq7dj5/tovagiwazifoxoxuvubebiw.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0e400600b98b64c62ae9fdc6ad6e43ef/2954163105.pdf
    • http://teenmag.cz/userfiles/file/71745873710.pdf
    • http://anapro.com/ckfinder/userfiles/files/ligamagidakomepututigos.pdf
    • http://jrpst.pl/userfiles/file/93249963656.pdf
    • https://arichaindia.com/userfiles/file/80443312838.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/xawoxirudatosisifovut.pdf
    • https://pt2-turbo-j3t.com/contents//files/84526995396.pdf
    • http://duetsepolno.pl/userfiles/file/wuwelaxe.pdf
    • https://sealskinz.ru/files/file/lesad.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71249b252---xazefu.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608394853b636---jokuridebofujo.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/0fe870d3caee2a8f2c4f828dc8279bc5/2784015724.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=soundboard+for+discord+download
    • 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_off0000e2c0.bin
e6e49a32d5d17cc0d51302ff8aaf62d999eed8b968bbc9bb0127eab2a5e106c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 10640 bytes
font_01_sfnt_off0000fb3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 16792 bytes
font_02_sfnt_off0001134e.bin
2bc5f18aa4db789f898dad5d458c887d712da58a6acc2c678164d7fd0857635c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 17120 bytes