Malicious PDF — malware analysis report

Static analysis result for SHA-256 afce99914702d898…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 00:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36b37711743335c056aef8c23114de35 SHA-1: 844499b5ceeeff7612089c4af0b7661111e6ad93 SHA-256: afce99914702d898f917f4e78945770a60f22ab919a423ec40d628c0c4cd5bff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external URIs and link farm heuristics, suggesting it directs users to compromised websites. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through malicious links, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=what+is+fashion+industry PDF link annotation
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/9eb13a563c31a953d250928a3e28a053/binagudonudobamubiwam.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/12136350925.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/tivutadotonakulu.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/varofivuwaka.pdfIn PDF document text
    • http://kisito.com/userfiles/file/xawumeboxujosabivunuvinel.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/jekazijimasozed.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba79d6b301.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/55175619803.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/ruvadubezasugikiwo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e988e3db---27104026699.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/winuwu.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/bilunovanurupabifunuviso.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qca2cif312gpl8dr4os33tg9qg/sonotu.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210912022703.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/pinemuwubujefekepifijadof.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/gajewofudaw.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/kaxuwolularojumerafi.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/80604804049.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/70276664497.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/pokizefajini.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/wewarovilozugumenagox.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_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 10480 bytes
SHA-256: 647c6173beaff71f22048d31154834a2c42672343a1aa663ea9cf9ab4297502c
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 17596 bytes
SHA-256: 30eaaceb200992ec097d1da05cfe92fe133e1a19072f3636eadf92e751ee8967
font_02_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1