Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d69d4c27c415a1…

MALICIOUS

PDF

94.1 KB Created: 2021-07-13 16:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 004b03a2b584672114dd1ecb12b91213 SHA-1: 4e23eb331078bf7f72e2de2ee126fad661d43a13 SHA-256: 85d69d4c27c415a17cb8de5f48fa8e886827dd6566cd1fe975d91598f3f86dc5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=where+does+the+exchange+of+gases+take+place+during+respiration PDF link annotation
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/aa057a1e9f3fcb06d081dfcbad6836d7/13657361186.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/56354436461.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e1d4dcf2f---bodevawonarigal.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/nevemusiwuvur.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/30767132839.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/t1kuaj2bog5kioqtv7f06nf4gq/basip.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/74297139669.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d661e4494---30800838298.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/1jllo0r9efe9ojdt4s4hno9f3e/42668348478.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf8d673a3---wugonakelawuzafasakaw.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f2614d2c7---67088649315.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/67c9d363a27585838f1031e6de57efd3/noxufofitu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa36aaa2d4---jipinumewotavuf.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d168f41711e6bcebdae3dcbb5c5422fe/65975016155.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b654b3f07---95670975146.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/64634156985.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8aeb41faa2c7bd7072eac37e31864bee/pemajibemulu.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ua7fvivbe6ecdi524s06hst9oe/99623315873.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/62885617619.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/2799310766.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9818e5bd3---33797362063.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254694ad2d---govonalelenopes.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6e2dc650a---tixin.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_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 11184 bytes
SHA-256: c456f7d572685d94a3039841cbb6d5ba798c175544e8bcd22b373ee08a118269
font_01_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 17544 bytes
SHA-256: 4338ba6e503f0a201ab02df5aa28b243f96e4d2f74cd2dac8bb136c5a499d451
font_02_sfnt_off0001526a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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