Malicious PDF — malware analysis report

Static analysis result for SHA-256 5441895861e4c6d5…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 10:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2755db99062f86020a75cf013aedfe55 SHA-1: 867995b382ed2474eaf82d475fd45e807105fa9c SHA-256: 5441895861e4c6d57757e140e7aeff07967a0f446d66ae2ba51e68c221ff61b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, disguised as a 'grade 7 math placement test'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://anukulagrotech.com/userfiles/file/46179598655.pdf In PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5785305914d112445664544733a97db9/wexafumisemejozak.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/25dc36d6fc000e6bf714850fd3a20667/48893738741.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/hpceugt73fl1aq6rc73oqqldcf/lodadupomufuwirunukajeda.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534f483b19---dobuvototadojugibeji.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/ranisi.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///moxosobuzorux.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/luligipegewejexum.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ecfecce5bfd83344fdf7fa265fb88ef7/9397200102.pdfIn PDF document text
    • https://rotitelor.com/contents//files/pofigijejatuwix.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2c63d38461853e98477932a6a6440a9f/7148544898.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/wamorofarag.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/obi6ubtrv4v1it4na0m59kkif4/lesegu.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/jubupiluwowaxugavobusupox.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/risufolalolezuperi.pdfIn PDF document text
    • http://belst.by/upload/file/repuzavisejevufimif.pdfIn PDF document text
    • http://hangquangauto.com/files/60868157223.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/70694091192.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/8812800596a27b9d2722e48bf4c14eec/87971180595.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f906657b9601f0153479285867338251/78767308591.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/guwaparevexixuvozuwizale.pdfIn PDF document text
    • http://scro.ru/pic/file/50786588843.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/56758770383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=grade+7+math+placement+test+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_off0000c2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F6 10760 bytes
SHA-256: bfe91627083d63c79341db62c0d8bff1d653747c6c3f5ff5d5d8089b1c40261c
font_01_sfnt_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 17200 bytes
SHA-256: 878dab993972912cc8ecfbbea13392285135a02b12175e599d9bceee71b9b204
font_02_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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