Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cccc95eede719c…

MALICIOUS

PDF

59.9 KB Created: 2021-05-21 16:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaceeb3718eaa0ec3b46218900f9eae4 SHA-1: db623c45708b7ff5d3b21e7bcfdab92cfc55f280 SHA-256: 90cccc95eede719c624b4e09224c44916ee234908482426caaaf3331a7ed1fb0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm used to redirect users. The document body, though heavily obfuscated, contains text related to 'free qr code reader', indicating a lure to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

Heuristics 5

  • 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
  • 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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7d03b667e---tusigakimemawilugorajug.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47281e2ca7---78054449931.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b06549dd116939577158f47f69ade434/zawutulugokanonikepokuno.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/oq4uv2bg5es3rju1tc5bcocbkf/vufowutazobop.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/63958a620539bf6d1c6fb68167d725b3/fizasefajodufef.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/2g9f6eu75k8fn7ub0m2to5slgh/xiluwakuti.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vrg7u5e56d398ocsiepp6ujdnk/86169210331.pdf
    • http://agcslohian.com/userfiles/file/delodolujipikubirix.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1ea51bdd2c555f03f934fa4bdcee0334/51716937583.pdf
    • https://samarpanbharat.org/trila/userfiles/file/vivowotisotizovu.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdc732eda---nixozobamitexop.pdf
    • http://alpha-th.com/userfiles/file/zewerurow.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0idudrd1kn5bo5lfhktbcn2140/wexirunifikakodakefuvurof.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/u5eedfn75i7odjla7oa6kenn70/bevetogakedodexi.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081b67617399---23035778709.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+qr+code+reader+%2526+scanner+apk
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77c.bin
fb94f1150847f71a8386df1a1d54141ec04aeaf601dde8066f2933ca05716f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 4804 bytes

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