Malicious PDF — malware analysis report

Static analysis result for SHA-256 b037851e8860aba9…

MALICIOUS

PDF

94.5 KB Created: 2021-09-03 08:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b841702b5fd8d1b857c4b575e0899127 SHA-1: 98277c30878bb0dbfeb8c6fdab84704da1b26af3 SHA-256: b037851e8860aba927d99c16699f08e1ed3b07b9c0bf6e63b06f48e8cff9def7
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. Numerous URLs were extracted, many pointing to compromised WordPress sites hosting PDF files, suggesting a link farm or redirection mechanism. The PDF structure and embedded links are indicative of a phishing attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=datacolor+spyder+5+pro+manual PDF link annotation
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f587cba74---22331420167.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/divuvavefagevowu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607638ac4c730---29127435615.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073e338d74f9---79717641228.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062900064673499.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71f75932f---26297325500.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1dd3ab845---gelobomikekemorijuzus.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/69446221875.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d89f4179---rubiwav.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609042454eb0b---dekeliligegos.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/paserepuzuzifipiku.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7713b8cd102215872da2f76eeabc2f8c/tires.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ffc93a052add009c044704839f35e321/mamebosogawamome.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/3228308198.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/49abc9ff1b2fdd7ed53696ef7d2ae15c/21748540377.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021073017242067.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/62167712393.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/paxulemibokumuwuwekir.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/16614159490.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/888a1bb3a6c135dc45e5b721bbeddaa3/gijetizufozulafedafi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/86us26bfgro35f7bnvtipaj0ul/fomekid.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf9d1f3ca9---muwokopufinilef.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/malilitu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/98fbf1220dc413eab4be084800dd03ec/24897406481.pdfIn PDF document text
    • 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_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 18052 bytes
SHA-256: 8848567f45bb4e1a8c734cb5ce736f2448da014fa014906a1fdd896ba8fc97cd
font_02_sfnt_off000152c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C5 10932 bytes
SHA-256: 801dbfdcb8ebbfa5e99cde1650b6f4a1baeffdccfd346a5ab7f959e7b05362a9

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