Malicious PDF — malware analysis report

Static analysis result for SHA-256 e762f4e16307c501…

MALICIOUS

PDF

89.4 KB Created: 2021-08-22 01:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2dc0cdb75d8f85ed20be4fbaa94338f SHA-1: 11b47691547193488cda7f75b0d9ab3d44fc63ef SHA-256: e762f4e16307c5010451da1a0f504340756ad50a8f6b6a2c5a5ed8f8185be55e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, which are often used for phishing or to host further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to distribute traffic or disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ketchas.ru/uplcv?utm_term=ap+biology+textbook+campbell+8th+edition+pdf PDF link annotation
    • http://webinaris.net/ckfinder/userfiles/publics/files/54561724419.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cf05ec92ebf8f6c0bf9888974dbe065/poketoza.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/rosajenuzinebeno.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8008aff8---52669005817.pdfIn PDF document text
    • http://keitbg.com/images/files/limedepivojinidaxali.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70629bc90---58996625947.pdfIn PDF document text
    • http://azizolace.cz/images/file/21449496460.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43f5820d1---2396620571.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/85707253717.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/lovewexok.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/xoxuseguzem.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/36782050244.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/34e72b3ba808e2e9cfae7ef39435fb41/rutonuwuzufameliwive.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1d58734f3d7f40100eabb9f73474b8ac/kinewusozodalapovo.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/87407337776.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bea37eb5d---5588797536.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jbm3cr3mbbbj5k55778hlndh82/legekiwo.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/difexinanoxosobulo.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/pisaxo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/86m0k82dneo34bs9dg5asb26j7/55797635642.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/dizagi.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_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 17744 bytes
SHA-256: ef975147512345c4a310854ec89ae2f3fe80466d0a85693e38f04af418d2d050
font_01_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 11436 bytes
SHA-256: 5dda58fe132afe4e3036e72e71856ffa097144ca72e7b4428d5104884b441962
font_02_sfnt_off00013e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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