Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac88d3a98961511…

MALICIOUS

PDF

90.7 KB Created: 2021-07-04 00:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed30d4880618942122cec964ade06799 SHA-1: 8744a77ab611de4858d7ee5067239466c47fa50e SHA-256: bac88d3a9896151146f2d24d78922b85f53b106c46c8b4610e8215e6ec9f0b17
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised CMS upload locations and disposable domains, likely to host further malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

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 https://iamtimeshare.com/userfiles/file/riposepirino.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/6buj10hls2vb0n76nv1gb7mvpe/gojuxuti.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/vc3nj8355let0ghgtvcckpubt9/34099995828.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5d4ad700---3603668143.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8855b5886e4fec52aff462412b3b35fc/17118060350.pdf
    • http://gmicropilotes.com/uploads/files/sokugajobagisa.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8afd8911ed---40939703903.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/28163555802.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/af3155b5d1cdd1417bd43ecf76a07c89/40042094211.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/26407672475.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5968eb54392f805e019e019765e3d5c8/9259369359.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/wotibezosebugaven.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d61574adc0---jizonekot.pdf
    • http://amphorabeautyclub.com/campannas/file/73292717833.pdf
    • http://wamer.org/userfiles/file/65972807118.pdf
    • https://accuratesearch.com/userfiles/file/lamudibigatimo.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3120872568.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/36199970386.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e6b20149---monulogoxifixuga.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3931703a7---gakigowu.pdf
    • http://archerelectricsupply.com/userfiles/file/zisojevatitazijokujotawob.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea2c8086e---zojegudodovotamiz.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/tuvezeketagit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=racial+past+lives+ddo
    • 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_off0000fe47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 16792 bytes
font_01_sfnt_off00011659.bin
8c421f394aaa16a4eda85ad5ea8824e050767c08f3f4b5ea76a3804fd2e0debb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 17620 bytes
font_02_sfnt_off0001447b.bin
97ae748ba96eeb0ede719cc6b8c00caba462fe4a4df66847b6174332cd6ffdc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1447B 10416 bytes