Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb89ea854d20e770…

MALICIOUS

PDF

88.4 KB Created: 2021-06-28 04:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 205cdbcd25d68605cbe97ce6535ae666 SHA-1: ebf6a0def802a3326111fe2bfb0af68349b225b4 SHA-256: fb89ea854d20e770f109f7bb90433ba38ec70704ea1fb56e209e1c2942548728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to host malicious payloads or phishing pages on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecdf27a49---32416660166.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/apmtg131f5nsqd56qhk7vperf0/69955466535.pdf
    • http://provia-events.de/pics/fotos/1/file/fubox.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/38512969760.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0def67ea0bc2226b00391a5e618f62bf/zivixetixegaxeli.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jjoq6qqed2rvr7phfh1cvfobd4/61603793318.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/168d41ec5ab7773c43c4ac7e9e443404/karifemuvepen.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73301f289---nifufajuzufomu.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/clom0mq72crt9jgdonlkck99i8/vufozojuraxolidez.pdf
    • http://fszhenjia.com/upfolder/e/files/20210603201848.pdf
    • http://trungtinjsc.vn/upload/FCK/file/10898849685.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6097e79e0d---wuromoluvu.pdf
    • http://garderoba.sk/images/_file/62309910797.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/32768635846.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/v5868pun9ghvtt2jba55qmarog/kutize.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d25d06a1---wevetujadun.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f154bc0f1e---mibugimebikekewokivuvobi.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/8cb2e8107eb0572f94fb92b83382cd97/28670224448.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vefizudafow.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v9850ftvln176kc2lecd82hn64/143298891.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f4233264---49511190225.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c362daf0e---38356794458.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=63nd+annual+grammy+awards
    • 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_off0000f04b.bin
28dc4cadf460134dda18b18139c018c3e8e8f36ea2e6947fa81d8376ea5c7d71
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 20328 bytes
font_01_sfnt_off0001240e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 16792 bytes
font_02_sfnt_off00013c25.bin
b3e2fe62e6057b10c9a185719d090503aeb0bce7def376990b4b3a12a0cdea73
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C25 10692 bytes