Malicious PDF — malware analysis report

Static analysis result for SHA-256 726e9b012552a942…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 02:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7ead54cd2b89967bb0705ef10cfe70a6 SHA-1: 25c73217039a18a7bd3da5317b48f67145ccc342 SHA-256: 726e9b012552a9426ddd020c21b1b7db2c8c9a3164bfcd05ae4e93ba08a69388
196 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, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_CLICKFIX' heuristic indicates social engineering tactics, instructing the user to press Win+R or paste a command, which is a common method to bypass macro restrictions and execute arbitrary code. While no scripts were directly extracted, the embedded URLs and link farm heuristics suggest the document is designed to redirect users to malicious sites or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://soft-pro.hr/upload/datoteke/77242349808.pdf In PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/zolomeritodun.pdfIn PDF document text
    • https://fishuntpesca.it/file/xivujivuzubut.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/67978455289.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/lufenebenuzaju.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/11431373387.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/megoretonuvifura.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/mujibeja.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tubumigejavid.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/88718725608.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/54400947401.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/lozozaledapizopumoniduki.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/safasumo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed01b75356---11338889082.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/2485145108.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nutalaladupiripema.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/41858787882.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390874cad35---jilizage.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/pudapavomulozupovel.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/64933405389.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/30920977116.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/39735742874.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210910_00599B0D5EB4A430.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/b8pilka1ravh3lnkvtp8taaeaj/fabemirekopofi.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/48349283822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=diskpart+new+partitionPDF 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_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 18112 bytes
SHA-256: acb177a4b3709c9b1d16ae716d69b5be15069f78f978add06c9b2008e2368f3d
font_01_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 10380 bytes
SHA-256: 2b12cd0465f824e7652d45a4de19f29bcdc0018218eecd10456cba22f8e696d4
font_02_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1