Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63142099a9ebe58…

MALICIOUS

PDF

86.7 KB Created: 2021-07-04 00:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1fd45cd4cbb9005bbcb277bc702fb159 SHA-1: 20037a579dc56694a0281dcfd382a541f21f6bb3 SHA-256: a63142099a9ebe5855aa70f64ece1aa432f7867432da08439b850a9226a8601a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://navigator-33.ru/media/file/rinifinizotowanoti.pdf In PDF document text
    • http://www.toptehnik.si/images/94153206804.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/686edb54bb1e3e5981cc6b2f414ba24d/vefuniwuwugix.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/70301543868.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf725349c2---dugimeli.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160879a626b3c4---979582454.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607c519624dfc---xolarozofigujeroleru.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/441kr1fdbpupjddmb7q33ch2jf/pawajovulajonujenozezofa.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/tevusenolufabekujijon.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d842cce4c66---mobotug.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc45ccfcc2---sopefigapovoganedunaxovuf.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6b7abbc808536cacbd0372168b5aea7/jakerimenigulazasunibutut.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4148921ab---pitifo.pdfIn PDF document text
    • http://yoron.net/up/files/wusun.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/xunavozarowupamuzewes.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd51d14589---fovupajinifusuzufewukid.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609109b44e55a---xemegenugesukawukas.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f065fef1---dotixefasakaju.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbaf527b17---jetorukojawupi.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e7847bedd99ae7b7c6378b4ff2ecc84f/wulugubavikomofofonuzumi.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/dejakisa.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b7446930---84554455396.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/81539648518.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/16810313818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+do+you+understand+by+organisationPDF 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_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 16380 bytes
SHA-256: 26c2afa56e749db8406159bb17f37be30c0204a0d1451cdd6d62577a77c2a511
font_01_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 10828 bytes
SHA-256: 1d9ce7b706a1712ec50a42e6454cd660230e9c5d9352f7702bb04f21a51b8dd4
font_02_sfnt_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1