Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad58439dbbcc0692…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 21:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 137703697d400f44301024e038dd5475 SHA-1: 4d444479a36dcad27a74dcb046bc79f1b99c653e SHA-256: ad58439dbbcc06929b9d5d2fb09be5188d9bb42744febfc757e052162070d3f1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The primary purpose appears to be directing users to external URLs, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://albatrossmrn.com/konadnew/userfiles/file/menebu.pdf In PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/sopar.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/o2mkmaaeee8urg0b9nvpgbrkq1/tigitukovuvazitibot.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/860c7c90677664e6a8463e691db876ef/besuloxofevuzomuw.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/29312463017.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e9b5e1838acffa2229b32228ed1b5ed5/nobukiw.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/fn29tqbki38tea8qtpephijp0u/zufute.pdfIn PDF document text
    • http://minhanh.com/files/82880054912.pdfIn PDF document text
    • https://avflash.nl/upload/files/rajokozinelogifitez.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/71549588001.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/47217941652.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/386be5d2edd923ddf6d10f9cb486d463/13378466572.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/75744551710.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/85906824650.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/sijazurojerugivemegamabo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b674a51785c---sutuwozoxokolopiw.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/milajusipovagiriwejagowu.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/relufuzegorikata.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ralaad8oig9rgha8q1moa5dva4/wuzutexeto.pdfIn PDF document text
    • http://chongros.com/userData/board/file/vowufunonazopexu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0be5c3f62b8f88dec497f1989fd0e35d/35891144838.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/93543453038.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6442e5daad---naneponanuduv.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/30819750237.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/xurupakusemiledawodebad.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/d3f6sj71p4rt13nsdmv8rc0gb6/55908105150.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/11054987537.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160784b0a1c7f3---97188129961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=complex+analysis+book+by+churchill+pdfPDF 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_off0000bfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBF 15492 bytes
SHA-256: 8915f81bb00c5b198c643cb744d7307f2d417087d1caf8a88bfe46f9226104fd
font_01_sfnt_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 11368 bytes
SHA-256: c091b12ce7e6125ca3fde4f6005389b38e7fd91fb1b17aaf23622ee5f81e052d
font_02_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1