Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5a15a5ab34e581…

MALICIOUS

PDF

98.8 KB Created: 2021-07-21 23:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a0fb9718c9d7bff0328fcee29e9ba1f SHA-1: 53241a933ac693a1919632f917ebae91853d0b2d SHA-256: 8e5a15a5ab34e581d371ddad08dce0c947737d517366a29e00b3ed7bf3af6b92
176 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://praward.tw/wp-content/plugins/super-forms/uploads/php/files/96830092ce79d8d6f2125babe3d2b4b5/96511876221.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6cfed8b6c---60312326070.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e18faa886---vusabusumudonimodepaz.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709752c1917---kutepanugaro.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r57a2mgcbqpesc0daihfk5kce0/ripupepobijotane.pdf
    • http://beerskiboot.com/img/upload/file/95519459570.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dae37fa5a9bf86d3236d28343a70b5f1/9391337472.pdf
    • https://airtelco.com/data/users/_/email/files/reveroriborafaxukiz.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3af10ed914---7727007069.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d725721f004---kafanoradali.pdf
    • http://valeneighbors.com/userimages/ketek.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607f656ad289f---25140308631.pdf
    • http://renovfab-menuiserie.com/userfiles/file/10683572795.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/46696401052.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/baa1846ccb3da2053992db0fd3453fba/60805966095.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/5797cd9b47d9215c62b9ff8c9dd002dd/moditeretozuju.pdf
    • https://kamarkosong.com/contents//files/jerazasidoxokeredu.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/sapejumadunopevilokixeku.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/bf56e425f7eacbe118bce71748e19abc/menezivolosase.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/db6af46e5a8e2a91c8c04592f2c7dd64/moxolepirevarop.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607599701eeb8---denozewidaginemoxisu.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/qgun44406mejrr0ej47m9e9uu5/81085381340.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b70c949a56---josalanapoputexume.pdf
    • https://confetti-seasons.ru/upload/files/rekogaxidifafavomikef.pdf
    • http://stomerijindex.nl/images/uploads/23573447488.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/pqssveao10u8mjd1a2go6qlm94/30722735084.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=long+haired+chihuahua+blonde
    • 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_off00011e8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 16792 bytes
font_01_sfnt_off000136a6.bin
a0422ee5943f304838145385a8ffe9c9df61bcc6082ba2f7a72c550f7d288a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 10580 bytes
font_02_sfnt_off00014e6e.bin
c33957b5bce71516ea7606bce4b129d58b5442d945072c3d769fdfb29b4cfba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6E 17680 bytes

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