Malicious PDF — malware analysis report

Static analysis result for SHA-256 affdcb669eb4ab8d…

MALICIOUS

PDF

83.1 KB Created: 2021-08-25 05:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7863c0841c737df70bb64f74eda3833f SHA-1: 0abee59e7bf9a78adf6a04eba734502a794b781c SHA-256: affdcb669eb4ab8dec51a13abae5e91aac1af3f2e6deb538e73024ea08ad6731
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mnarch.it/userfiles/files/lojigaxasumonat.pdf
    • http://fszhenjia.com/upfolder/e/files/20210720123735.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ea396972cca37516318ecd9bf92455d1/3828942445.pdf
    • https://red-adlay.com/upload/files/gomoresexilejofibeni.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e53f958f9fd---20987538136.pdf
    • http://shamayachts.com/upload/file/zafedebipiponijewosen.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ebee39fdc96d8190814b62a09ea6adda/xagazuxoge.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/89227512701.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5187670d---keripumanuxaboxudivufokal.pdf
    • http://vina2002.com/uploads/files/rupugiresuxekozedu.pdf
    • http://blackshirts1960.com/clients/876325/File/18722088807.pdf
    • https://alkathirilaw.com/userfiles/files/68361491390.pdf
    • http://steakclubhn.com/campannas/file/31701976167.pdf
    • http://antropolog.ru/userfiles/file/40221929368.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608947e425bf7---76137021447.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78b3e65be---nutidaliginewowokakujufom.pdf
    • https://laetitiabernard.fr/images/file/rosagesuwolefumo.pdf
    • http://stolizstekla.ru/userfiles/file/82248917183.pdf
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/62627902473.pdf
    • http://mu-rrrc.com/userfiles/file/kakajevop.pdf
    • http://grafiport.com/userfiles/file/siridevurewazodumebufivo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=washing+hair+after+dying
    • 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_off0000e271.bin
b26a4b1889df282f862d77ef49c1180424bedc72339961bfe325e300612c28df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 10572 bytes
font_01_sfnt_off0000fa52.bin
c608525debff94dfd50976af61d6d4c347317eb465c587df4587f6b628b0e2e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 16824 bytes
font_02_sfnt_off0001260a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1260A 16792 bytes