Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff73ea60abfd52d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 11:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b61c5f41a49b0210846759fc5257f13 SHA-1: 203cfde884a7e6101041f31840c8bd430c068ec2 SHA-256: 9ff73ea60abfd52d3d451533e74efb019d32d3540825e0ff3f82e5b1aea1ea4e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on multiple domains, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs indicate an attempt to distribute malicious or unwanted software. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://phuketwebstudio.com/ckfinder/userfiles/files/sixogovotalebefupazutexoj.pdf In PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/buvowigijufigepoxaba.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/77036020249.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/wafejapo.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/tixadodujukapu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602ef64fc2---14350231009.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/54435673225.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/busepizosewigu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613326867a2bf---buvulijojawawijefi.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/59881444170.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161424e43edd3f---5334125606.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b0bcd58c---77668281910.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210913151403.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/44780469557.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/59064602197.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/43073424394.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/2597029500.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/4042980229.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/25740469921.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/xorerevonituxesali.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/livejalomid.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/65750015397.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/bobalovedulav.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa62635acb---zanukevurokitozimulepomu.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/38977375934.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8bee4c8558569808d8bd021b73b659ee/zelofaxegovetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ip+webcam+pro+downloadPDF 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_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 10492 bytes
SHA-256: e24398821a40cf88a5beabb5c2195eb7664085834929b2298cbec7454667954a
font_01_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 19020 bytes
SHA-256: a924be1d09df60c5681dd124ed244a42a966b8c0174c9696789496f43a5f1e24