Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ad77ff44d1b61a…

MALICIOUS

PDF

95.8 KB Created: 2021-07-31 16:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdbfdb45c1e0df59f7d375be4a0cc77d SHA-1: fd01e9f23eeef586cefc378e146f575d3d8d7a75 SHA-256: c8ad77ff44d1b61a1912ef739243ce422ded24f05b627bd435dd6abb268862e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tbbudf19tsid3ucs1sqj63u788/setemafazebezapegunete.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b25549f2a---43532145230.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/tuzikunesusetarami.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0feqd0uru1h9kdl6qh0u51moo5/zufenasatawoguvekem.pdfIn PDF document text
    • http://technocom.pl/editor/file/26155242245.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/11701459679.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160705d7cd41a2---sabamak.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/risotawudakezorogixelol.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/sesenewavarenodi.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/31247799134.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210723_092403.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607376e704ba9---15539930962.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/99311094982.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/78393911114.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/4566504810.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1587f45d9abe5d1fcfba767640a5eab3/81325959670.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2cb24892eab3f6e4ded1395d6526ea1e/bopegorugek.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/de4c7a87103f8955a21794541d5ba016/75460362132.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/45861138109.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/mixowavake.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160824e3e8d45e---panugevezuzixovatazavu.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/suxagosumebesulebolut.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/gadasobovobumumuwep.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8ff0e21c7---97075337232.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848503a8f02---binetaf.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084cbbfb2ad1---2687175902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sandisk+usb+drive+not+recognized+windows+10PDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 17940 bytes
SHA-256: 53226650305177b16a7a2db3b23cb232cb79e90c0af9ec477dfd421c44983708
font_02_sfnt_off000138cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CC 11292 bytes
SHA-256: c147ce079147d85db5b3a16ddd08fa433f2277c397fd62e82ce594b9a0b155a8
font_03_sfnt_off0001535f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535F 18224 bytes
SHA-256: 3d8797936cff4a8fe0eb52adf777e4c513c81c1d2400563d918d1aab373ca527

Open this report in the interactive analyzer, or submit your own file for analysis.