Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb1e44104661ba6…

MALICIOUS

PDF

74.1 KB Created: 2021-07-30 18:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee94bbb22e3f71d7b2b262102902272b SHA-1: 02ffa08287e0eaf073bfa86c59cf15edcaeb2646 SHA-256: 5bb1e44104661ba6cbaaa0033ab3f19cb2f129ce9c0107f777c4c533000401ec
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs, such as http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c095c9495e3---74407745512.pdf, are likely used to distribute further malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c85ae2dcc---parodo.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1ba94d36---vakibofuxonenive.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608611423eb33---sutuwokamig.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3b6e1e69bd0af2dacfd47976eabcfa6d/32956635965.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7dbb0696---39233848031.pdf
    • http://modamoda.nl/uploads/pic_lib/file/begogezibukojisozoj.pdf
    • http://radfordhsclassof1970.com/clients/878146/File/mojipokegutojano.pdf
    • http://mistralizmiryonetim.com/uploads/file/20828486869.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ae9d30d58---37300012903.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1fec6a75b5613b809109ab010cd1745/narugo.pdf
    • http://consorzio-csa.it/userfiles/files/70802213369.pdf
    • https://mimpishio1.com/contents//files/fejovekalenit.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c095c9495e3---74407745512.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072af97ed5f0---4346626467.pdf
    • http://ifa-astrologie.de/userfiles/file/juwumamerusezori.pdf
    • https://silverlabpupsforsale.com/userfiles/files/wepemesopulej.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/16c36fef32b27d2be6f32dc77646e186/foralo.pdf
    • http://smcertificationservices.com/userfiles/files/99003919685.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fd537db1f---pojumo.pdf
    • http://northmarking.com/userfiles/files/wuwafogafadejijumigufo.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcb6510c9---notibarusimimixi.pdf
    • http://doo-san.com/userfiles/file/20210720025739.pdf
    • https://vienhung.com/webroot/img/files/mixawes.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2eecce3e9---pewexatawudasuxipo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=corazon+salvaje+capitulo+50+completo+dailymotion
    • 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_off0000bda1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA1 16792 bytes
font_01_sfnt_off0000d5b3.bin
0df4a7e8cb5d88f8be1338f1607b4274f65e13c26d6aed2c2336afd0b9fc8e2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 16000 bytes
font_02_sfnt_off0000fd66.bin
63a8e895a5066012c94a0e1bfefa73568283330e9a50f5c054e9ee220a54b1bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 11432 bytes