Malicious PDF — malware analysis report

Static analysis result for SHA-256 842e40fc86f57280…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 17:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a804ace06710e024048c7d47dedb1472 SHA-1: 83d59a24312a6a30a6a910d8e6c4a91d9a5fbb49 SHA-256: 842e40fc86f57280a4323a6bb39be9c05e48c817827c544302ec0cb7dd1cde9f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lead users to potentially harmful content, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=addicted+to+you+amheliie+pdf PDF link annotation
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a77359e729c---wodexuruluvetidanuzedav.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/58285303564.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/veveragosamataxufanara.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/5fa8ee09d7bb9a7f155abb2ab22f1380/5829054376.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/molegoxiwunokezawutiwa.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/rarigimimego.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608effcb92d8f---36782538833.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b869d6ad92a---67226995968.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/55977932539.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/469b5b997ed239e142b438bb20596964/56494253126.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c63f99026e5---506298127.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/f94e7d5d4402ecfa123702adfe19511e/lagela.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe763415f---pivojatugud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e03d0109f9---zigosatesututusux.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d6d05995ecfb6705bc89672b0d1754e6/43043416445.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/fegenagedabedizesamozikeb.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d20d067a8---42854856982.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/kitewuja.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/df5ec243d1d8fd7363fcfb8a2321f63e/rutip.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/sewumeme.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a948b526910---befebavorexu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a84f388e09ef09fcb88c58fd5696b90a/nerosivofaralozuwagob.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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 10708 bytes
SHA-256: 083b07f1306a8a30ace50663e2a82ed922c29a7960efb855cb6691726ddb2a9c
font_01_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 19076 bytes
SHA-256: 7701a2e8dde6d1753fd5a5ee836062b5aba0a39aeffa9d5af99ebff48d58c630
font_02_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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