Malicious PDF — malware analysis report

Static analysis result for SHA-256 5862d3208608e663…

MALICIOUS

PDF

88.4 KB Created: 2021-07-07 11:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea99659e7d41dad3fdb6e84aec7566af SHA-1: 6ebad556e1b1bfdb0bb3ef31d55e768ca147127b SHA-256: 5862d3208608e663e2470318a1e1efc7e0cd79569363ff8076c21190f7fb8019
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery information. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may leverage embedded JavaScript or other mechanisms to facilitate this social engineering attack, likely by directing users to malicious sites to harvest credentials or secrets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/44esf10sh6rc05at8uhv7cb1bm/goxudelupuwedadidogawin.pdf
    • http://aqbnb.com/uploadfile/file/86613611109.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc708450a---tajusesipajasaxes.pdf
    • https://peterdegendt.be/file/daxarukotozuzidagirise.pdf
    • http://amirafouad.com/uploaded_files/file/42824814657.pdf
    • https://artlabjo.com/userfiles/file/53047534398.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f540f70918---12692176778.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e9a6ff70---28315531433.pdf
    • https://wittnebel.dk/file/buwofafagoz.pdf
    • http://bumsnab.ru/uploads/files/dosimizuxafenem.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a98817b2---66862570235.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/t2af3iqpjn34748s0qo81h3gj8/4156314540.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f4d5054d594111918b398ae465063543/likojopaxitigoxavi.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/30ccafc748e4f7cbfdb16219c5bc66c2/98360408932.pdf
    • http://otoozevran.com/resimler/files/savirokaxolusozupegiw.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99e28e803---14202019071.pdf
    • https://sunarchegypt.com/userfiles/file/monafezeladafugabenupux.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a82b5ce7490ca509138d7d85b4cce879/fadepa.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/dulofemexu.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bab6692d81d704c1afc3e8e9ae31400d/seduxerek.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1e9242c3---22487310090.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160739e2696436---4308913603.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcad068be5---12084160856.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cryptography+iso+27001
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f697.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
font_01_sfnt_off00010ea9.bin
8ce587f2adf4ccd16cd1778bbe1e0c0b9a300ed5da7e91d0cb3d848b964d1572
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 17224 bytes
font_02_sfnt_off00013bc3.bin
ae0ffbdaf62e450a768de59ce80373453cbb24f5c6417b81b2ec0d882588a2e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC3 10736 bytes