Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f09c85a8ee45dc…

MALICIOUS

PDF

84.2 KB Created: 2021-06-27 17:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 949f76ea54e01c6702b6fccabe5ee84c SHA-1: d1f9e2b3b2aad8f601b61d7421c04b9958463ca5 SHA-256: 48f09c85a8ee45dcdb66d23faa05e7719892cdbc0b15b5e832cc9f9a021705a6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious links. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, which is a common tactic for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this malicious intent.

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 https://unitjaya.com/contents//files/robavosu.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/5860621421c901c9e8d557ff320b1a46/temuxurotog.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbda4b807---17148196517.pdf
    • https://eravukappalpalli.com/userfiles/file/kedukoteson.pdf
    • https://prestinieurope.ch/userfiles/files/teromukulij.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3d0d8f92ff65c1c9c24e9f86862d5a7a/zuwazorijafu.pdf
    • http://asokmontridental.com/userfiles/file/kilozewil.pdf
    • https://nistd.in/userfiles/file/pujevef.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m8bludnocpv3s71imbapvihvd2/31993578956.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a935e2b4---73841225804.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607755405a4fc---bopunibunozakamape.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210516001813187.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071435892fc0---6412153894.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mbh1ltiltofh3l1q61ku0kfppo/mujasupub.pdf
    • http://fields-on-earth.com/34285112931.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/00bbbdc5f6f80720ae57cbc09a0ccddc/xizukofotibibalatusekiwa.pdf
    • http://studioturina.com/userfiles/files/xixibozavinofepufiva.pdf
    • http://rainbowcaterers.in/userfiles/file/vasupawe.pdf
    • http://abc-tel.ru/data/File/wolajazokexifuvabeledoka.pdf
    • http://scro.ru/pic/file/fibatonir.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d947a3de---11849863666.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6a252f0853f6082970f9e0a2ae0b28d5/vufewego.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=messages+app+icon
    • 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_off0000e664.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 16792 bytes
font_01_sfnt_off0000fe7b.bin
acae33bd4fdfa01928ab46b6ba4be5938d5eff3a38569de6d544fb739f4539d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 10300 bytes
font_02_sfnt_off000115cc.bin
f1209a0286d7aedd4f6910594bff96418e3cee6245508db5ad8007996e36fa13
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 17472 bytes