Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e666a258214b4f0…

MALICIOUS

PDF

74.2 KB Created: 2021-09-09 08:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7bff4cb30dab80e081d2890ef320b0db SHA-1: 018339ae1ec3d34754a064e15cb9c9344ed7dbf7 SHA-256: 7e666a258214b4f057df06457f4ba64830511f18b7c5bfd096168c79139a8da1
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, presenting numerous URLs that lead to other documents or potentially malicious content. The presence of 'utm_term=robux+inspect+hack' in one URL suggests a lure related to in-game currency, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kiko168.com/UploadFile/file/20210908015229434.pdf In PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/27854656980.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/kimojadinowepuzinezod.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef8627ea3---13906150196.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9cca74177bdac02dac2c0ca7eb8cd0c4/benawokozaxilijusafuno.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/88249941121.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/dajewitixad.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/beluxepebozolopuxoloderak.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/namivejazixejili.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/3184106240.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/36094581204.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/wosewerirorivogozojo.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/57706558595.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/6536865580.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/be1fa3.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/gm69fm2um15l5h3nqb3opl3g33/42821921083.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/kivobuwojurolugo.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/mojopilunokuzegevo.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/85264096318.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/47081224453.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/xapuvanutuw.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/32894403477.pdfIn PDF document text
    • http://myphamasia.net/upload/files/wajeriregunejipixaxure.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/resupajavirafepo.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/83008178746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=robux+inspect+hackPDF 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_off0000bd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 17408 bytes
SHA-256: c2eacfe33fd7cabdb51b153feb04cd97a9769768a355cdaf81e0a70adc09147c
font_02_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 10804 bytes
SHA-256: 438b9b655620d7741b9e895ee0c22a89a35aeaa054ce6bfea081aeb6dcc2c23f

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