Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e0cf7b7ad7f9e2…

MALICIOUS

PDF

92.2 KB Created: 2021-07-04 00:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1f7b1e8f7c5a354c3b4432b784dfbb1 SHA-1: 13edb54046b0f69e8278d19299891971a31ab4ad SHA-256: d5e0cf7b7ad7f9e2a157432443ad60de5d1c85a784221d74efecf7d5a8009d75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/71917bce25ce2041041dd06ad2aa3e63/nanobu.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923580b1f19---larixolijubawef.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/1142441186.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/786e5f4b7a4f5a44e3e4802b5b514a8f/xezugogevigonij.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ec0c6b961---fowevibudafivoloxuletos.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68d489755---movajugokog.pdf
    • http://dunajecbiala.pl/upload/File/87911362791.pdf
    • http://flyags.com/editorResources/file///kapupodobimalefux.pdf
    • http://www.peretprod.ro/content-images/file/20224525579.pdf
    • http://driver-jazda.pl/upload/file/48511345920.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085599a0a941---89254887158.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/k0oqtjvq4vu38p0jpjiv5om646/53062457216.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdac256698---rofiwudadirivemuxizujaba.pdf
    • http://www.tobywells.org/media/fckdir/file/ramitefokoj.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609290cc9603e---42058006351.pdf
    • http://sodrex.pl/userfiles/file/towedurejibesuzavuku.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ece6cdd32513c0eb9b78e00d9e298bd0/83121099703.pdf
    • http://drironcat.com/images/file/58474040865.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0c890dac---biregupenipo.pdf
    • http://www.findvoters.com/userfiles/file/49806967336.pdf
    • http://bioscipublisher.com/files/upfiles/file/98559176877.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=scale+master+pro+manual
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/757f9ecad4ba8e99bc71b2259028d375/fupanebomurifajof.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40e.bin
86d57cf3f3772149e482bb35a6e6f9388d07eed4f426d8cc86ac30ab49bb7812
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40E 18760 bytes
font_01_sfnt_off0001144b.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 16140 bytes
font_02_sfnt_off000129be.bin
bf85a083864b7af664d907e6d312cefcdc7a7a2102e6e8bbb2d6ef8ee36d69c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 1848 bytes
font_03_sfnt_off00013256.bin
eae1470f91907020e2f0776333a6a89f949ba9e9506c5b2257d02a52c61c5cd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13256 10616 bytes
font_04_sfnt_off00014a9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9B 16792 bytes