Malicious PDF — malware analysis report

Static analysis result for SHA-256 82af352d4742cbbb…

MALICIOUS

PDF

88.8 KB Created: 2021-07-01 13:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9162d32345e74c1219851b956b76e348 SHA-1: 87a983f993317ad6f6db113cb98ee10d07427639 SHA-256: 82af352d4742cbbb5ac17bb38c3ba65279c4899713795be87d75aa4ccb03b320
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file 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 potentially compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://coretry.ru/uplcv?utm_term=3+months+and+3+weeks PDF link annotation
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/63443bea242738c1526c64c258d3de62/bujononipokix.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210625101625.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/jojikazo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35b25c039c---wonojeres.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/08b4de07b897e986e2a4b29ceeae1862/nifoxoj.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841006eb736---42777536555.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ss6g9bh1c5ullpidk6n1t85al6/lasox.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c733adb5---xekegok.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/61163090767.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/9195461038.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/vasepuwadaku.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8cb3c154463e8f0e997a69c97b605274/66646681980.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c040c16ad50---kitalolagejejeku.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/senesekenuba.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/titem.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/44185749147.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/j6j2ecl86v3e5tn9h9gmr9orm5/4513543415.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607733c0797f8---gawufiderujubizadez.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/63f511c8713cfd09d01c6cec1d1794d9/pepoludamuzosafutiweb.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ssmdsadjapgpttghis5k94gdd1/kegunipo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/312ba2b60ca6dd1d2dd616fa9e058f17/malakunolibaz.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_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 17024 bytes
SHA-256: c2d045e2e2332720ac2f1305c4efc049c7b30982d1c0e95c717ec2205175f590
font_01_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB1 10528 bytes
SHA-256: 59703f6c907d724039d3f70ba896e1e219c328b67c3ee88df12b8b1d0e27e35a

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