Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b62a0d12658f9c…

MALICIOUS

PDF

98.8 KB Created: 2021-07-22 21:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5b9b1136c28fe08941b8be6a1280ecf5 SHA-1: 69d8ab19176792a1284b0bebf216addc98c4d12a SHA-256: 78b62a0d12658f9cd3acf3dd8a2bb92521e0e665486163b863ac566a0ee51d24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/14bcf1f8610c3663068096205cdcd8df/11529768458.pdf In PDF document text
    • http://chrislahoda.ca/userfiles/file/jirejozo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/86329061080.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/garoli.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/be8134c21522c81134ccf1cf4fb97bff/lerosebamebukipunururo.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/46730272861.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a018e45592e---65140587596.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/60716380617.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e481585c99afc4d11e674a4b33967a34/55960692271.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/gugapogulazavalalekobepiv.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/66050350294.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/55408c5dd781c648335b0ac9713da902/golobafagunofefes.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0191bb8ce87995ee12d7525cebd6704/54530531136.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8447fede---sokaterafan.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210703214559.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/95628856508.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/38740902748.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/59530490364.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcab19c3a54---65627100860.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/60198243235.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/48490944155.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/limorulenipojoborif.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa4c5c868---66970851397.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8fba9f19---48188092411.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/6b9394d8870b01a19bb443ce56bb271b/70826208068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=re2+remake+cheatsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f859.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF859 16272 bytes
SHA-256: 5d4671d1332e890e117e8760d76ca70cefe9e63041615d1f5b80c5da97a076e1
font_01_sfnt_off00010e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 2652 bytes
SHA-256: 32b24ac805865da8ce7f80a060c3755a994f15b3f9573cb103e6357ed6b73eae
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 19856 bytes
SHA-256: ed7393d18e64aaf8d8569fc59d32d54881545814df0ed719dff398690226e4b3
font_03_sfnt_off00014cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDC 10388 bytes
SHA-256: 1f2e9afb3ccc2f97568a1c11a53c2cf6594699d48be279ff710b6a60e60b1ddb
font_04_sfnt_off0001647e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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