Malicious PDF — malware analysis report

Static analysis result for SHA-256 274c91ca5f0811f2…

MALICIOUS

PDF

103.4 KB Created: 2021-09-07 06:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd50ed6238c65942402f29b26ea3e951 SHA-1: 724373d2f7cc8b65e04ab27ade09dd1428c42c2f SHA-256: 274c91ca5f0811f271afd2a01f9de317beb08cb0c9f28e2e3b75d510770fc1ef
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://immodraft.de/images/architekten_agentur_images_/file/rafisixeke.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/453e9db204ed1c400fb0a7fb6953278e/nujadonagivenejo.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/451e57704838bd8c4871b5443270a31c/denimu.pdf
    • http://bwc.lt/i/60926800445.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d44b1786a---veganaw.pdf
    • http://meetburgerusa.com/uploads/files/23509437638.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/10832116732.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0ccb5a4d9e134fade308a667eb327a9a/28149431089.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5csktaevio3ps31dmsmcla3pe/rijax.pdf
    • http://spec-so.ru/sites/default/files/file/15106284675.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4ecaddffce81520baa7f526b11136d8/xexitubigi.pdf
    • https://luminex.pl/upload/file/womudadabijevexiz.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb490cb9c9---mimem.pdf
    • https://farmstead.tw/farmstead/upload/files/kuxukesobutekexi.pdf
    • http://sun-eko.eu/files/file/41366624820.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdab8ba2d---92517438770.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/21da01ca90a5a34a3765d56c99304a93/dakegaxuj.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160817164072e6---53713068139.pdf
    • http://sahamit.net/userfiles/file/90250514259.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073783457117---ximobiwukomuxazojesadi.pdf
    • http://pn-tech.net/userData/board/file/67920169687.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/d8t5h31quib78e0mv6duv9l6gk/leguka.pdf
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/f87768d8160cb51874390804848b497d/vojogasazolop.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610300ec8b444---12886947283.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=disaster+management+notes+pdf+jntu
    • 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_off000117fa.bin
e93a07f2994c509b801dd72e7586073f32be131ae928ca51e86a669b047335cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 11028 bytes
font_01_sfnt_off00013162.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 16792 bytes
font_02_sfnt_off00014974.bin
8611dac1c17b24ade73905f487242d5b5256c282d23017ef28bf26095f26b35c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14974 18744 bytes
font_03_sfnt_off00017947.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
pdf-font-stream PDF embedded font (sfnt) at offset 0x17947 16232 bytes