Malicious PDF — malware analysis report

Static analysis result for SHA-256 929caa81f96250d2…

MALICIOUS

PDF

90.5 KB Created: 2021-08-12 20:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48a11db7acc1af51c0e6f6071a7ee757 SHA-1: 677df8465c966e75f36b17b2de164ea1959ac709 SHA-256: 929caa81f96250d2dd921d4d788ac23093f329fe436b699d492bfd88842270f4
156 Risk Score

Malware Insights

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

This PDF 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 compromised CMS uploads and disposable hosting, which are commonly used to distribute phishing content or malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/815b977085c622ffc5b05b3846dac23b/wixepukedovanoxalixisip.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c63cf9683cc1c5d8c7371d139de0e070/12299702833.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/60797839859.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c997dfbeb1c---xoloforetifu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b0c73e892b10a9aac0c2ba97c04f75b1/pobiweror.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/66664323490.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/rivazojikigela.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/suvurudeve.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/itgjj4najjk5ru3of8278onib4/50628310876.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/gukezumuxifibedujeg.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/bojadufaweseruromasas.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/291751412681.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608deea049829---bemuwatasit.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c1298e39527---41652330583.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/jumawitugelalamuza.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/juxivulebevenijofug.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/98057324011.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/31512568284.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc55ba8a8a---rotuga.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/likuxijefudevez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af6695529---98305006410.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a93d46b07---rivejizelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=guitar+chords+manual+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 16468 bytes
SHA-256: a3eaf92a93c642eed81390c5c98ac8c933f09e8594007f554dd567f889b62e4b
font_01_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 10892 bytes
SHA-256: 56e1b27488dd35c56e498ef908f6208430e63da66bba5ecc4cf4a16dd45393e9

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