Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ca34deb2501830…

MALICIOUS

PDF

83.8 KB Created: 2021-07-18 05:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56bbc728c295cb31fc4eeeec15906dbe SHA-1: a5ff822ec81b3f87965f8a12292234f372497fa8 SHA-256: f2ca34deb250183031822fcf3b9c08ea54c21b4f886c64e564770ee813defa98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the URLs serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://curry-box-deluxe.de/userfiles/file/68005344423.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lgp0us4k06vp5lmr68vks57ecm/89881644519.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/52718601188.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/fevelalirudabupajowaso.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/44783287556.pdfIn PDF document text
    • https://ebooksweb.net/files/file/lovefolunulijuro.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/15070420358.pdfIn PDF document text
    • http://digifast.cz/userfiles/jukitusodig.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/wedanixu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d359939d618---kosutunidodagatudo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/43c9fe186ff05946215558059ce2cc22/3351460254.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f67bded1---norekupenapusupatibix.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/tagejesotux.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/60589938629.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fe10ae05---64165664224.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/58918463863.pdfIn PDF document text
    • https://chp-travel.ir/data/file/24501336886.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6327a62079510220947c69e20d549cf7/896838037.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160af8e10e25f8---10101267060.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2612fdec8ba85b98661a05d23b22d735/figokumetedavalejevaso.pdfIn PDF document text
    • http://tipiland.net/upload/file/tebanumozosutinavateja.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nuvewotagarozega.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be9dc63ef2---57045841674.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2aed33a95e4b5f30836512c7479b7092/28560561087.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/857ccb22750e3f01a76f0cce1cc8fa77/74546817151.pdfIn PDF document text
    • https://aspirans.com/files/file/gupumojazerokopema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+convert+onenote+to+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_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10620 bytes
SHA-256: 7773c9b1195b9b5fae3bb5c3621edc033a14bd3a6a570d05ffccf36b7cf5fa36
font_02_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 17136 bytes
SHA-256: 124291fef08a7f6ab7ddd6e15dd5747064f4a8edfdb9fb0ce3b622c6050c27de