Malicious PDF — malware analysis report

Static analysis result for SHA-256 1978760d95f0e5e4…

MALICIOUS

PDF

98.1 KB Created: 2021-06-25 21:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42261d57d888c6ce376b4d097fe754c7 SHA-1: e5d4204b97a9908018e5351e6eca07385bfa2cc8 SHA-256: 1978760d95f0e5e44e3272f8ceb3942430426a41bd1068f4a1032c43e296617b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc930df5fd---bivozetogonevuduj.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hv1eo0kr0j6jtssunc6fbc57sl/12535291700.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30037739be---dufujixutamegixilefuxito.pdf
    • http://booklandbooks.com/userfiles/file/towokazeripaxejalum.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e5117133c---radufapofizix.pdf
    • https://eobliecky.sk/userfiles/file/75617161751.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b59674a6---28988972119.pdf
    • http://renknh.com/ckupload/files/55755026845.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sj8omrfkf345lddo7u831ttpj4/87354988983.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f68c86598133a109f41ddfcba1ea617e/23440299615.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ba837f04---minasez.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jr4tq687k0mg7nm01dka2o9qdp/dutukimiwesulixararuxekow.pdf
    • https://hanahana.vn/media/ftp/file/tavufumus.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b065023b2---menigowuxafu.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc351ec2b3e---nilirudir.pdf
    • https://italvaping.com/file/31875698414.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b698d20e9e---gumowesetugasidekazofup.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4a78748330970a2ad7421bcac9c56731/levesumijide.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bccd419be504851722b3537aed1620d0/47698313497.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/4c06f0735fa4cb5d5f64f4c433410e68/gewewekubowivebideked.pdf
    • https://raptiherbal.com/ckfinder/userfiles/files/59087375800.pdf
    • https://stillwaiting.org/userfiles/file/93730504871.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc331096a---10772724874.pdf
    • http://scamps.biz/userfiles/file/xuxesilefata.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=esther+play+script
    • 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_off00011d57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 16792 bytes
font_01_sfnt_off0001356e.bin
e9b5a6f75c9ab9d496879efbb176601db80fa7d01d5cec4dee3dc77152b6adb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1356E 10344 bytes
font_02_sfnt_off00014cee.bin
8d30c043c24df6b14493201215221ccb14ba7ccf3188ae25f465d1dc78a4e55a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEE 17812 bytes