Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fcbcd037f48a2f…

MALICIOUS

PDF

89.4 KB Created: 2021-06-30 03:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcc81637ae25d94f0fd90d2c29ddbc47 SHA-1: 0e03fbabecd1aa35a97823f3e44228dcb54d8ac7 SHA-256: 89fcbcd037f48a2f7c86e169ccd3d87dadb7201cb3e1877d5eeef2cf6e10b00a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, which are commonly used for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination or track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://rotang.net/userfiles/file/koxudinobefidipataketo.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31484ec47---likuweveku.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fdd369f19---penoruduwojeropuruxazevip.pdf
    • http://vom-ragnaroek.de/uploads/file/24727631425.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ca0km4ji0t3u9q3433ud9sr37j/tadozunokigon.pdf
    • http://geoplan.su/userfiles/file/73803788818.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c46e4c0c8a---16496639656.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c62b14652---turafi.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e16941e59---81383229515.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74eb7749af36eaf14194d52cd9922761/36898859609.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a53ad216---78533992151.pdf
    • https://skspiti.com/userfiles/files/nopageludizufowujipagelem.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/9qqqllise1qjskerm4mbnctbno/baguxokilawubabamedi.pdf
    • http://www.europesolidaire.eu/userfiles/files/18569482974.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2d3b1b5c---71268494200.pdf
    • https://faresaldabbous.com/uploads/files/bakoraxobo.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddca12e84---biroxif.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/96d8bda532e9ba2f45bd256972358a87/65386217501.pdf
    • http://mai-colle.jp/userfiles/file/xelal.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160796334cb34b---pejopezi.pdf
    • http://vervesimuhub.com/userfiles/file/79793278400.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/357b6bdc18d26776cafbcfe39daf5795/renavodolelijonuvitipaban.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210607115750.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=baby+muscovy+ducklings
    • 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_off0000fbde.bin
6bc213665303cfb5ba2e03b5ed5f5af814bca8102e2eec60f69b1a13bfabfd6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 10948 bytes
font_01_sfnt_off00011508.bin
cee92dd87515d12fe6fc2f57501eb59c30dee158bbb1dec940bbc84945b3a542
pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 16760 bytes
font_02_sfnt_off0001404d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1404D 16792 bytes