Malicious PDF — malware analysis report

Static analysis result for SHA-256 22814c836e048c86…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 10:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f5119d2571748299c07a7658b57c00c SHA-1: 62217bdf4712b43bfdb87da4266afe9c46ccb562 SHA-256: 22814c836e048c86bd50cd960a310c108bd0ab70fa99b4d76bbf7f9c0cde06eb
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be SEO manipulation or redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ablerexthailand.com/userfiles/files/jadovogilegewafasotu.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/seu3ogu4qaoj6t8d181hluvuiv/ziwovifuzamukodokigamewur.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a9eef1695---19070719572.pdf
    • http://alnadaoil.com/userfiles/file/75755165774.pdf
    • http://abwingsva.com/uploads/files/54604856844.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfbe15884---78825241893.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ced1c97a38e---gegusa.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/oevlcaap592ot2tp8hl5pfapb1/pimobivasarozuwi.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/polodazij.pdf
    • http://deurenhanger.nl/userfiles/file/11395342426.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9cfbedb9a---zizozevevipazuvaku.pdf
    • http://pcwenhua.com/uploadimg/file/1623384592711412139.pdf
    • http://anandamsanyal.com/userfiles/file/21624011361.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c314ce0cef---nepugi.pdf
    • http://royalgroup.at/tmp/nusokegakofuwipafen.pdf
    • http://www.allatpatikapecs.hu/images/file/37700749722.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b1d31613---61698181690.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff53edb42---polamutuzize.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d249c44ba30---wokopunisab.pdf
    • http://resetimpianti.it/reset/public/file/jamorakegelotuvidirejug.pdf
    • http://xaydungphongphu.com/uploads/files/bopawerobonatarusu.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98fe9853c---jufufofewiwida.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=effect+of+temperature+on+solubility+of+gases
    • 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_off0000de2b.bin
994055dda396ab82e9649d703642ba40bcc703b54cee4db266e88ba41114d7c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 11160 bytes
font_01_sfnt_off0000f80e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 16792 bytes
font_02_sfnt_off00011020.bin
6c8b3e83b954e0ca947cb4bd3239c82e7922dbf3b42bb1a96238ab7b688a514b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 18444 bytes