Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acc726295aa9f94…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 00:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b2ff60adb52dc87c62a96eb5dbc8577 SHA-1: 71ab446f1814f0164814cc664291ba959214038c SHA-256: 4acc726295aa9f94aeff0fd16b5c4d1594d4f43b6d221684e8666fa37b0eea3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to facilitate phishing or malware distribution by directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://slbreakingnews.com/ckfinder/userfiles/files/79572693348.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe05566d69---tudifigoriwa.pdf
    • http://remont-elektro.eu/archiv/file/94882277892.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160839a39997b3---lepowiw.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c5cfb71e9---sawurosegiwabimomozona.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/f18c5a8264e2fbfdc1753e0110fa73b4/xezabivewivubobe.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f17e80b099a5aa03c7ae8af6173d07b9/falixajake.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160859a786d9f1---53262878943.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9be90087c0f55fba30126e3e6428dd65/87984733069.pdf
    • http://ufnk.fr/app/webroot/files/file/97388154675.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/65pr29b0dtd6nmug2e943bhl5i/jujumopovixekokiw.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/a385470b97723a4ba7b56420bc9c6bdc/rewadamufotadojag.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7b28f454---18124177317.pdf
    • http://fly.no1-yes.com/userfiles/file/tabagotipulevodila.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/v6tqi9hobg08j53j66q41ool96/vemogogepivemekixijem.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5knieii7o511tj7uked1jnlmip/76239878411.pdf
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/suxozegisego.pdf
    • http://banlinhkienlaptop.com/userfiles/file/92437135017.pdf
    • http://misosmile.com/upload/editor/files/8406373908.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4khlnkhauuqpno1off1cuttcum/mujejupuropagovovilabale.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=should+you+sleep+in+afternoon
    • 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_off0000f5f8.bin
bb60fa09bec0e083e958120c4f8f24397a51f63703dcba6142ecf0185101c4eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 17224 bytes
font_01_sfnt_off0001231e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 16792 bytes
font_02_sfnt_off00013b35.bin
ad80198ddeed49b672f4a2e3f0014c9a789a1c13c03353ab4bbe0b8c4ff4b5ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B35 10884 bytes