Malicious PDF — malware analysis report

Static analysis result for SHA-256 38539e40f861b185…

MALICIOUS

PDF

116.5 KB Created: 2021-06-29 05:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80e0a6b07bef74f1b4d20e356b3f7024 SHA-1: 0b8de08f7ab10d5195b8056dab69420c1e34f7d1 SHA-256: 38539e40f861b185a08bfe406dbd501040a76c91d9b15165a1796f4d07ea59e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8c771305---dadajigukifokepo.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a14a99a006e14a0a07ad8c815def4fa0/75739735538.pdf
    • http://komputerzagrosze.pl/userfiles/file/71054685948.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/j2jh9v8il00vbotm5qgub8b914/92867610505.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qtfbod0it2k8r8hp64dam5u8a2/pobidenuvupowotumedexiwug.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b76c17f3---31326617372.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/792701ac1dfcd83360a28d9904b3d6bf/potagukek.pdf
    • http://world-green-hope.com/uploads/files/xosatuzibuzobasa.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f52fe58d6---5721639287.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160807a36a89ef---16678783580.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5e78fc4bc1ab32ddf64bc0921de33fae/rajojenejepokazutedo.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075acfee45d3---lofivopifopudofitirexu.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b5195e5edc33c3a4058f5afeae01f67/25607090280.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/068550ec296405a0cd1d8b6f4ecc33c8/93399156004.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/likuguweko.pdf
    • https://flardochform.se/userfiles/file/sivugofinezirawesefejifi.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/088e5975c52f25985a065f05b494c976/80613400848.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3284cer7vn0ede6b4gcervtscq/71553037513.pdf
    • https://dollarplus98.com/images/upload/files/dawuzuluvigerufexebatujis.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7cff7e0eea025b33a7c6c6a635d72b54/18126897423.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71f894afd2---xezegitulemenaz.pdf
    • https://questyme.ca/userfiles/file/15139286220.pdf
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/1925909124.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd98d005a---levifavusopebisit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+future+tense+of+have
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014ae7.bin
9e8d2ee5ea7fbfaa748d8391cf59001677e40663f3ec4e80cc034ce0455f2b27		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14AE7 22004 bytes
font_00_sfnt_off000124cc.bin
23dc89cf7e20befbb372e80fd2e6640c0c9a393416ab871bb67f95211ade5e81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 3552 bytes
font_01_sfnt_off000132d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 16792 bytes
font_03_sfnt_off00017494.bin
8076351012bd0be164abe21bc77a588adbca71d5b43c058c7afc14b463bb3c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17494 22744 bytes
font_04_sfnt_off0001abdd.bin
90022918c9df0798a306142e2c326afee8e7b171c1f94a909eb890b491390387		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABDD 10424 bytes

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