Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5e376b783c55e1…

MALICIOUS

PDF

88.8 KB Created: 2021-06-25 17:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c7b3213b38538497f17db8c22f5e3a9a SHA-1: a757c08409825a4f59eaff1adcf3ac5608b9cbb5 SHA-256: cb5e376b783c55e1e873bcd525f1d9b3806d5cfff1748772b4e714284b4e9823
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on potentially compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/814bca174c68ac9ffc475edd85d0b2a6/95330172179.pdf In PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/59aatbv8if3uldjbeh5q1k5c59/mowasosunoxa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2hkm0qr6ftalsn3i27tpt8cnv7/fuzog.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/34695969126.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d18ed18e3---wajelef.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/79817177597.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/88955657273.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef70dce118---vizixetudo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/2371ad220e30b943e7486f1afa08aa73/80961118638.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8332a9d2a6---befudetijiremudoneluzo.pdfIn PDF document text
    • http://abnicum.com/files/file/surefunirirejim.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/1334456046.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6236e7677---seripazotuba.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b361c03325f82bd80bbfdb7d7b64e0d6/samukofozitukesefogot.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/22485979989.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210619045409.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c73c4fb7---kupatijevebebotu.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210525064801_a4tz00.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/30f297628dde21df2526ced441312227/duwozatejutaba.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2dd4a3187fcd96ff941e2f5bf64e3fa4/52823090753.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0ab94270---pipuvitepoxa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ir5abqu0biaqprkmohebbn7jn3/kumazarujajo.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/80634689858.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/j24ggc92gkr4bvk5n82tv09hnh/tuzamawafaduzizufalifima.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c70204ac80a07b26b013bf7a48b0c6e6/limegebepumunufalego.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/4342606052.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa01a96f4---46275663822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=oxford+discover+2+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 10772 bytes
SHA-256: c7bc81261854c5668dc485449cd1ef1d1ed92ef47bc6754315aed3a9a2dcf286
font_01_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 17220 bytes
SHA-256: 6b16cf5d470f202c52ed986a8362a48a5490deeafbabd0fefa9e32d9d9b33a93
font_02_sfnt_off00013df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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