Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f44e683cf48a18f…

MALICIOUS

PDF

85.7 KB Created: 2021-07-04 11:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4c8b324cccfbc0a5e394511e79db66b8 SHA-1: eb1c853287649b62eecb1bd7205a469f4f832a4e SHA-256: 1f44e683cf48a18f3538073d64d416bcd4c01fe96e495ee0039033efe6dd6d0b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to external URLs for potential phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=the+chipmunk+song+chords PDF link annotation
    • http://kythuatviet.vn/uploads/userfiles/file/25332785667.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/13730880116.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/lovolilofowuzulora.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/durudezu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2inbu06mseclvr9vtut8focrf6/sefodivomube.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7825a4eaa8---xojizifoxivumupifuxopun.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/48374084263.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/bac007224e07014d4ed357eaf9303c08/nixuredurobofune.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/7208bd8a81f38cd90725b194c3819556/62245594881.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/79907e491362c4af757c354cad848ef8/wujato.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c68b20ba65c8133afb7b3de3e1175e39/43446839145.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4940d0492c---dutizokurin.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0aa2cj67jcgpp6ivnmuda83qc7/majavewokuvazulapaxud.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/50717320483.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/67956705430.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/43993487fedfa06117da96986e857fe3/26100851452.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/digivipunekitojipeparumak.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/dafen.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6b73a81d71e463f1bf3427d7a1aac18e/gebokowegevapilimowozapek.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jaum6fq36qtu7o37cvps0g883n/58428433558.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ailcbcq9grh864o7ufh353745i/lupodifutejekonunutoduwa.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/zokoruloduxusujoxoto.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cdb4e5d9f56a2f2e2e65256218ac5cb4/vipogafe.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_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 10808 bytes
SHA-256: 4bb3793309d79bd45e12ae86932759edeccca317a87a14db0bf8b5387aa81a40
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 17852 bytes
SHA-256: af34dcd08ad7c9c0cd73a170ffc9fdc5ff9eb1c391bbe2551f37082abcc84f67

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