Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a4ab57880a630f…

MALICIOUS

PDF

93.4 KB Created: 2021-09-03 19:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7eba6a70afdecfe2c803827583cb44a SHA-1: 677df89876107f3f1657bbe4b0c2bae4c67f6b0e SHA-256: 22a4ab57880a630f0acb0226a4bef4e2f7a3149ff45f6b9c952729c3ad99c41a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity, likely aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://huntic.ru/uplcv?utm_term=quantum+physics+intro+pdf PDF link annotation
    • https://ceccarbotosani.ro/userfiles/file/98748688158.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddfe993427---tiliduzobelamemitobip.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/jonufurez.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/57971065953.pdfIn PDF document text
    • http://teresachild.com/upload/files/81364185825.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/93228795346.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1oacmp3j2254ctdceo5olm3md3/jewoxiwaxeta.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0df5b7335---8063054622.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/91260170995.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/17d057fc2f067ceefcaf52e294fd2321/72419324081.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/dejes.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/vufisimijuzonozojeno.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e034f08ff4---28627724598.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/adc057afe4b7a249704d4eb8005bac01/jubusugivo.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210817_084734.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/72826227861.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5b67a218---70558594563.pdfIn PDF document text
    • https://heyratacademy.ir/file/72438726698.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/1565ae0a31a90c5cfce87321b61dfbe7/13306513349.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90406493086.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/safup.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/32807884534.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b84f5f20d---55047182476.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/11177722198.pdfIn PDF document text
    • 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_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 18832 bytes
SHA-256: 54098b37bcbce47a320e9750b8b7be020e5522da794ac3d99367bd3f712dce24
font_01_sfnt_off00013642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E59 10980 bytes
SHA-256: e741ffe8d85bfc9ee857b0404d9253fcaa8e266baa31642db18dfd0fdbac21c7

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