Malicious PDF — malware analysis report

Static analysis result for SHA-256 44291877b2c3ce75…

MALICIOUS

PDF

109.4 KB Created: 2021-07-03 19:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f31183ba6bd7f4428b6f701d188abca SHA-1: 9b6ff28585ec0bcbb3d7b5dcaaabce3d6340f036 SHA-256: 44291877b2c3ce75b86496d6e732c1f5f8c6649d3d742738cdb4c75788082907
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97eac096ba---67344864794.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qkgd3pqc39uke6ovra19dmf5v1/53212461029.pdf
    • http://myshopekerala.com/userfiles/file/42131275588.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/20661577803.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6ovi2etcarts0opu95puipfpsg/95070096034.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/485c24ee436c0487b289bf56309de259/45791464760.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/mkttaoa4q0bbsj8b5030p3dq01/dadunip.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/74066245141.pdf
    • http://skolicka.eu/foto/images/file/rolerexedosadinemalo.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbb98df9a---xisuzuxomaril.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da812a9a9d---43840803670.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f433e52ce8---6611196294.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/d7q10cdgb63kofbjh0lt80vs8o/gafefepaka.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160715868b56df---63751575103.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c0f4f8b56dd7db7580eccae33886a35e/62957654759.pdf
    • http://abimobiliare.pl/pliki/File/26201363856.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a839582ad45---tiruruz.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/612891f7d5ff034e02fe986b4527c8f8/99224889651.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8b88d6e86ed45a54b8bc0143f3f7ca60/65329059268.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bdeeqrdudqcvsfg5ve607lrkgg/toxonilokidotulavul.pdf
    • http://hnkingdee.cn/Files/file/20216724526.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088454483efe---puwirusefibosuxid.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/14472795536.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773fd2b381e---63253350472.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=a320m+motherboard+front+panel+connectors
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 16792 bytes
font_01_sfnt_off00014414.bin
23a492852c6a8e011ad1d10fa4db9d8f6709a7c32deada75d6239d011d15338d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14414 27704 bytes
font_02_sfnt_off000184e5.bin
5761dd2fc54108aa0965e41834749737e83b1d50956b2cf7f91662d033c72cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x184E5 1740 bytes
font_03_sfnt_off00018d2f.bin
db724d14f31203a633023ae6386e19b34e7912b20cc7786aec38e236ae3259e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D2F 11328 bytes

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