Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fd29259847af7e…

MALICIOUS

PDF

83.6 KB Created: 2021-10-06 08:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 010b76e9bc2b1dc39efc4370fdfbd25b SHA-1: 0dfbd0cca0f29be4828b5bfb44ec46ab9fefdd35 SHA-256: 44fd29259847af7e2c6a8e2429bcb857d1040a45593c03e98f1c83d286313585
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as Pdf.Phishing.Trojan. Heuristics indicate the PDF functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://papinchess.ru/userfiles/file/76085039727.pdf In PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/duwowelab.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/bovego.pdfIn PDF document text
    • https://heyratacademy.ir/file/temafiwixafa.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161582afd1be34---xilinegatipitujoxig.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/girofava.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/49738685365.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/pumivivorujilelutokenow.pdfIn PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/lobonomawelevubalofexije.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xedipazosobob.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/muligo.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/96560425801.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/21408834194.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210913182006_lnajxp.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/37942121550.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/nanesuvekop.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bkk46cqt6dsraer8cevk0ctki4/pefuxa.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381f2a03fc9---77276216494.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/38135973882.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/20084096388.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/lesurezuzedexiregagerema.pdfIn PDF document text
    • https://asi-filter.pl/files/file/govobojilofoweroz.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/mivowefagarowavu.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/72381421710.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/85790093842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+nun+and+the+devil+moviePDF 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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 19128 bytes
SHA-256: d2044eb630c01aa23229a9edaa68e930fbf7c37aeca09bce26a0462e9e0edb46
font_01_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 10372 bytes
SHA-256: 032573a7d4e88dde19934dd0b98088880a679a3ee4a7065b04fc3acfd0aaf968
font_02_sfnt_off00012878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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