Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64928ab0d1b8dc7…

MALICIOUS

PDF

162.1 KB Created: 2021-07-16 14:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0680e17a5941004859ee542b0fd11aea SHA-1: d6e56dd8cc898a492303fb93472957891778ddbb SHA-256: b64928ab0d1b8dc70d9ef45e16e784c9764d76685501abb7f08213027d73b363
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of these links and the detection as a phishing trojan indicate a likely spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9243

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://aygroupmuh.com/image/files/77412857240.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/tdfku5i1vkjvnmldlveihevh1s/pusotijebitajumuzokilab.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/36754737.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/pobefifododebezavigi.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/89f2b89e54985fde511e8bb215d73094/21309480677.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/tidunufepatazijigale.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e7cc2d549---93847971767.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ce2febdc8f2ef2c1279bbdbb8bc9de57/43639366419.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/zoxokoxeboxizegurupegufe.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b0f87ee5d009fc41740aec77c3a2a73/sarofuvote.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/pimexuwabotepepibipave.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503143358143.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/bujanagufusadiwolotime.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c900ba74912---16345591444.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/iur6ljuvbsl2m3cruoikptth55/teviden.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/41544569312.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9q3adlqh70e1u52fcj05jeppah/wizemujak.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eab1edcdc---kunudatasuxetofalewulefu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9f5cf2f6b37e7b169021ee0e93e2ccee/sonalisufa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e427486550f---7635769322.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d625f86c0919adb10f02bdf17b661253/pudakeforexelitukekube.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/83758327642.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/mufusupimavosomadoxaten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=streaming+film+weathering+with+youPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000173cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BDE 23364 bytes
SHA-256: 630669824621420dc82fa11d56ec2af37ad14f38f41e3c76188c8d50c65ceb9b
font_02_sfnt_off0001c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C64C 16232 bytes
SHA-256: b646e4e99f19ac05519abaf59ecb91311bfd919e7d59cfb2ca623a477a188405
font_03_sfnt_off0001dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBCB 48376 bytes
SHA-256: 014631fe2e581a9f3eb6773a7655203a98a884b7512b392ae4b5ec6b35ff57e0
font_04_sfnt_off00026119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26119 10868 bytes
SHA-256: 5df548aa216b4f5cbf63ddb455afaca5d81834839d9da74a5ea1e6c7d4069959

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