Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b195f8c744bf84…

MALICIOUS

PDF

82.8 KB Created: 2021-07-26 10:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d94b298cbc4d3e0a3f0d16ba9bc63e50 SHA-1: 337e2370883624a6ec9d5fa604c97c292ab68c6a SHA-256: a4b195f8c744bf8459fd46da07131af6be2d89611f68f72297249d27f4a0ca95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. This structure suggests a link farm designed to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083258eaa4a6---wusiwadika.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27e3edffd---vekiwagojomevogagajekiwuv.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/72fbfc67fa2814590f5b3b303e5caee9/82430041270.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/27014918847.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/delubu.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/4278373052.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/98880737686.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/70820554539.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/853aacdf0073a575ac0fb07eb398a17b/14861170500.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/24874991423.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b44de647e9---jajoxilunagisesenivape.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puzepo.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/17615570035.pdfIn PDF document text
    • https://tigaintan.com/contents//files/pilex.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/samuvaradozekelukegasukut.pdfIn PDF document text
    • http://hometeamcorp.com/images/usr/84838497032.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6cd4e030a3093ae8dab9c158c5b15f38/2877482081.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/18031281533.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/dazejijinovewajexufofu.pdfIn PDF document text
    • http://gotween.com/userfiles/file///96359738124.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/18rujfl6u288m74s9j6uf6n80j/sibemajoboti.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/27a37a72679f59bd99b203150c0643a6/nosuda.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/31939482378.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/84203263062.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3ac2027aecd04dcb64df4edaa49f52cf/rijananuwedes.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/55210064643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dil+hai+tumhara+film+ke+ganePDF 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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 16868 bytes
SHA-256: dc889abbfea03cee6b8abf17a0988dbc9c08ae8796682d633278d302560a32f2
font_01_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 10568 bytes
SHA-256: 39f8273ba594987ef8bab4dd07ec5587b1b07d4a7e134f2d3d6401fd2cf40d7c

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