Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae7f3e3e95dcf21…

MALICIOUS

PDF

76.9 KB Created: 2021-07-12 23:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f649f08f8f89e7a9b6cf68afaeaba19d SHA-1: 0143de53b78cc35bcff45bfd8b68319e406a89cf SHA-256: 7ae7f3e3e95dcf21962772e960334250ea9a3b6017482c0df1cb29d415621155
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it is designed to lure users into clicking these links by presenting them as relevant content, such as 'cdse question papers pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://allytemp.ru/uplcv?utm_term=cdse+question+papers+pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467dd5e0a5---wugirunegix.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/visekewok.pdf
    • http://nesemlak.com/test/images/uploads/files/wekuf.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ac742213---61520136312.pdf
    • https://adikkedua.com/contents//files/60385040879.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e4857691---rabejijirupukarokeruxar.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c85195c099ff56badcf0053887d97b49/wakafemilaxi.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08fc3cc967---zakipuwenifegunuwawusiba.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/fisadaxatilote.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vt16k6lgj2ira1kk0bhtvojcpo/37335619957.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/xinotaderejejakoz.pdf
    • https://lescourailleurs.com/upload/editor/file/lolemeb.pdf
    • https://ktmcollege.org/public_html/userfiles/file/pawobuwu.pdf
    • http://local-minicab.com/survey/userfiles/files/zovorun.pdf
    • https://codecs.roimages/file/suzuvujewijifagatonun.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/13576f94d20d9f4af9d1afff849ee6b8/15980074224.pdf
    • http://hum-lucknow.org/test/fckeditor/file/31236512551.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9s48mkn2tq5u0ninc1vkekr7h7/64469486725.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ubkdeedmpu6eedqnjt0iri5m8a/rapotudovemovaj.pdf
    • http://ceskylakros.cz/userfiles/file/sifozinenipepatafer.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/2adg8j11ctaf9gtvujbjipdrr4/90357667958.pdf
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/21567643264.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7250b45294a739863bb155ba09626da3/namadivorosegizuwodoxini.pdf
    • http://abacusnancy.com/userfiles/file/gemaladagufu.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609177e23d0c7---41002660261.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a29ddc388---varulesowiwetat.pdf
    • 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_off0000caed.bin
cf1755317cf2f76ed74322f70ae9d4e797efbc8a65256c5448dbfdfff2acbf09
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 10724 bytes
font_01_sfnt_off0000e375.bin
e7939809935ec5d9b46b737abb03b67341a4c66712b5d762e41edf3d16d4c79b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 16464 bytes
font_02_sfnt_off00010e27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 16792 bytes