Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1822adebe66add3…

MALICIOUS

PDF

81.8 KB Created: 2021-08-21 06:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af341b0785d1eec82e027a762290ebd2 SHA-1: 57533c9c69883ebcec1a2121dd1c87f7fa9df31b SHA-256: b1822adebe66add327852557726cec8197fc51a7a0de38ffed780faa229c824c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware. One prominent link, disguised with a Google feedproxy URL, explicitly mentions downloading 'corel videostudio full crack 32 bit', indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8014

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://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770fffbce6e---lirewupufafipox.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/80utbh0kvc07v8fp5md4f40dt3/gunipini.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/38716397218.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/84359863286.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/renepilogula.pdfIn PDF document text
    • https://cecprint.com/images/file/zurejesovodowixesax.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7b241c10---4716615088.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/pekizur.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/mevozaga.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070572e6c405---dobidonigu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/pc9ot9sr4p37h2u3i6k3h3lks7/siterikigi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c373db64592---fekotilaruzowisuxizo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/vedowugoxesesoxomuzo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09307c4eda---xigozudogopepi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbceebd953d---39799604399.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160deef1e32a00---63970752691.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/sifonubim.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g1mngpnbok975dfciov9765hgk/xapifevunujavixum.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/segere.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/3388676929.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/josafupiwelamemefadet.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/nunafovipotezarivatev.pdfIn PDF document text
    • http://kleiberit.ru/files/file/37619263695.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/batatomesaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+corel+videostudio+full+crack+32+bitPDF link annotation
    • 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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 16844 bytes
SHA-256: 465d5f900462dcd46e77a0e0a7398620d6575ba50318c076106d43f94fed3007
font_01_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 11248 bytes
SHA-256: 80ed149da6029ef73b7d382f615378971fe79a2e64170373decc3acbba170348
font_02_sfnt_off0001290c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1