Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a862fe8aba86d9c…

MALICIOUS

PDF

77.6 KB Created: 2021-07-31 10:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4b7f005d6d6e59ecbe0ec1b7d3b6c31 SHA-1: f35042459b102fb939228daa7f8f896a412e99b7 SHA-256: 6a862fe8aba86d9c634a715e869dfe6d25a0655efccf0588522d5b13069de7bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this as malicious, specifically a phishing trojan. The presence of multiple external URIs and a link farm heuristic strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

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://rulada.by/upload/editor/files/ranuru.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/23f6edeb135674d93a406f3ad1d5ec3a/84951404451.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e2f43860---85021194123.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd2e900529---xiferowojodan.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3f4699ab---lepojumon.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o7knh7tccmqtg11otgmqrdbs02/95092072454.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35d2f8407e---wubogafonuwoforukovomog.pdfIn PDF document text
    • http://thegioioto.store/upload/files/gejibavajelazudegafa.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/55343978419.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/22328eb24e573d125a8ee0d0534c0c01/8742603134.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/269a6d70026d573d8c3c8f0e63b48f40/vunemigunuwodid.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/92483624319.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608cae8e9aff1---fevikalupusisedu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1c0d0da5---92759578428.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1498812640a867d4c07741b0495a65f1/1539637961.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/c39b805aeb8236b2e97dd2102d6e836e/6398700949.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9187d0b3a---wupuwanewivefavudaw.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/74486603535.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/xowuguvarep.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/verularibaluda.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/lazowonujuzof.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/lirebalekutoravobavuralol.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/25975190022.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/kofevivodurebodowo.pdfIn PDF document text
    • https://loctra.net/userfiles/file/9335997054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+incredible+adventures+of+van+helsing+co+op+gameplayPDF 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/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 11448 bytes
SHA-256: 2e2c3abf07abf24c8cbf9346af5460d3504e98449df6011cd82b490e108d400d
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 16220 bytes
SHA-256: 1ba0a0cde949e1aa0bddf66c84377dfbedc8d6458f194780d7ef0c40a7a51e24
font_02_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1