Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd8264c59f33b97…

MALICIOUS

PDF

100.4 KB Created: 2021-07-20 02:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a698b0576d5d6f1968f1b78b3a7c3328 SHA-1: f57c4d23eb0acb5fbdb5baa4a76e6e741e486770 SHA-256: 1fd8264c59f33b973f84ab1f6655ccb4115b1abb9713a855f5581b73bc365420
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://aep-tc.com/cache/fck_files/file/39515905150.pdf In PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/e4psjbc7ng2rb9q5rge4mvs375/pugalegezetemanasik.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14a533545---86005235183.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aab066acbb---lupim.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2c56e42b---kulegilenazugirapuxi.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/jisokomuvipatido.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/2750529472.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73a12bdca9---lexow.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/rurusopiritoxevetufeke.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/660ecabcd8f2bfe883d6d0c4763baef2/funevotugabijegu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/68253250072.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/fulipinetunabaresurunib.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/4947089675.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/77938546022.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/mavok.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/dc1ad8da99804c8abf1599e8dd318e30/68695667546.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xumuvelovemiviku.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/19331312343.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5j62mbl7e4v4sov3j6gvqckub4/tobupenasumosafen.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/bejozavidujemi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d184a7c6022b790253292d47c114df7f/30527157936.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/duvumikefavatep.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d41d51e3c---43811279056.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289392ee2c---36780024416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hilarious+family+feud+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E66 10708 bytes
SHA-256: 92d4c14b2538e7c34b3352cc1f1893b4aba58671edfcc099528ca36d7ec65ad6
font_02_sfnt_off000156f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F6 17512 bytes
SHA-256: 316d5b4dba8cd93c304ea50671b07502c4032e70465bb09e0b6029a9262f8a2a