Malicious PDF — malware analysis report

Static analysis result for SHA-256 7176d1b555b10e6d…

MALICIOUS

PDF

97.5 KB Created: 2021-07-22 07:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fed37561900c87d07a227330b0dc004 SHA-1: 139505bce8d0fa21a80653a707998010fef71343 SHA-256: 7176d1b555b10e6d6f0d596df9c88604a98c8e262b7554280603f9fa52761677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and content indicate it's intended to lure users into clicking these links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://paperland.bg/uploads/file/lirefivalox.pdf
    • http://wittlich-luexem.de/userfiles/file/31162993047.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8093b13ec---38066146209.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/pamizabebu.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/39bc09f0e0604f7541218566e00e1aea/24586635302.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b218d42e---68528333414.pdf
    • https://npkfertilizerproduction.com/d/files/mesitanoxogefavadi.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608952e8d9704---46060259033.pdf
    • https://oliogalanis.com/file/sevilebonad.pdf
    • http://art-lan.ru/uploads/assets/file/muvamojoba.pdf
    • https://speakingparrot.com/upload/ckfinder/files/51648871807.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/db8cada3f8fc7c96213aab81c267e9a4/nutojokujajopovedebure.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6141fce889---73211226986.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/03d8236b467e2871a67f9cbfcd2a28d0/gokuwolek.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779eff8311b---73804137554.pdf
    • http://sns.hu/_user/file/22676367016.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a35787ba---34874136632.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda7e7ae3c4---bafusozataga.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c8cbbacb3d09df8141f2c99350edc204/34317191211.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/29012559931.pdf
    • https://luathoanghuy.com/uploads/files/22245859130.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=song+holes+in+my+sweater
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001170e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 16792 bytes
font_01_sfnt_off00012f25.bin
33bf01d2e4181fc148ef7c419c16dd234bdc239c5f728b137e4da306c5190514
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F25 10828 bytes
font_02_sfnt_off000147fc.bin
ce06c8e7814cb3217cdefeb247d527a109cbdd81e178d15af638c367ba80eec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147FC 18068 bytes