Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b77b5c2140b0bdf…

MALICIOUS

PDF

98.5 KB Created: 2021-06-29 16:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce900d21e2b2f5fa291e3bf3eda05310 SHA-1: cee00fb296aa9f814b744417ba1c3a06fda9090f SHA-256: 1b77b5c2140b0bdf77bd41d7f80fcd6ab4ab9a6073f649ea42254004c657ec90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's purpose is to redirect users to potentially harmful websites, likely for phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/79c3d3b002da39ab5a6c2444069c7e01/pigolizezojuwopolikej.pdf
    • http://alexhoffordphotography.com/temp/files/file/zotofudekifewiwexabuxowes.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/81283515628.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/65863971445.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098d09f7ccdf---vinonapizife.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/jogech1f4beir1p8mr78q4qu24/bixebudexizebivabe.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f74317084da302e8c02bb35efe41ae02/41704317954.pdf
    • http://momsystem.ru/public/file/51736593111.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d55ab74b0dde4d425e39472fdcb38b8e/97667487308.pdf
    • https://immobiliaresancarlotrieste.it/file/27441202976.pdf
    • http://www.bluewhaleline.com/image/upload/File/59259638800.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a3ddf1dcebc5dd67445a08bbfcbc5db2/72659428446.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7e2fe45bd---99675582325.pdf
    • http://jyjwqj.com/uploadfile/file///2021052313082128.pdf
    • http://ahcxdq.com/uploads/file/171404045624.pdf
    • https://ascinfratech.com/clientprojects/trading/file/xuzakoj.pdf
    • https://kede.org/userfiles/file/pigerirofuvuvekoseki.pdf
    • https://festival.bg/fckeditorfiles/file/25934077294.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/93a48b9d664c5e9bcfa07f217e43b031/88359480991.pdf
    • http://brmxn.com/userfiles/file/20210616230051_iyd5to.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a231de3012d---bivakowuje.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0pu2nm1j8e1g5bgq5291t1h73o/gugesidajexapa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+little+prince+in+japanese+pdf
    • 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_off0000e1f0.bin
5f6b67f4592cce8c5f8e83a69472cd116b97abe762968da7e2235579b7cf38cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 18832 bytes
font_01_sfnt_off000111bd.bin
5d00bcedf53a19fabe203242e847381eb59ebbcc45840ade72ea8442bc4d4620
pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 19504 bytes
font_02_sfnt_off00014bc8.bin
25bcfe678c4bf4f9d0ccad189ffc3c230e62783140a8b3e06542c380f08ec010
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC8 10688 bytes
font_03_sfnt_off0001642b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1642B 16792 bytes