Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7aae90ec9fff7b2…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 04:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f3136fc5f82b7ddc03db9070ea4420e SHA-1: 2843e9ed5a195e8bd048c154d1964eef6dee1edc SHA-256: d7aae90ec9fff7b2e1e76a44d4ca87e3881203b5b9f8e01348373a0b4aca5100
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a243f1c5186---93212633487.pdf In PDF document text
    • http://abacusnancy.com/userfiles/file/vafixajegenisuri.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116b54594b17---galeziwaputozanifa.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087852c37ffe---wekesebaxetamexuxuteton.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b22d79f9---vevukigobaxozenolele.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/xotobidipedadibi.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/bowibajagotowuw.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/98597399092.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610377df2bc0c---xanapitowotos.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/6353797009293e857a2384252c71a966/88110305260.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210718041957_622316667.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/nisokutozetudevafevewu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jnvi0jk68a8kcjom0rkek7muvn/nopugowefagugirazafija.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/bimirepegi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490403036a---votopasofibojexege.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a730fd10055---53069997232.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/femal.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/40005033014.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3e4c08dd---83888324049.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/q88fr7a0r012vu1931albk3db2/41427572358.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ca005f5bc15fdbcfa313cc0f6b8841cc/meduvodamujaxovijedefugox.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feged.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gazuxozuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=neurotransmitter+muscle+contractionPDF 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_off0000c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 10468 bytes
SHA-256: cbc38e2824acbeefa7c2cd58d302e6a70f28e2a85e221676cfc91e615ff0caa9
font_02_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 16084 bytes
SHA-256: 13a8765430d5fb3b55c3cffd46d7620615e6374aecaeaaef5d4e094de3e9d22d