Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df68fc366da63b5…

MALICIOUS

PDF

92.8 KB Created: 2021-06-30 13:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6569b56a1fa3849483c4220d0ad0d8da SHA-1: ba8cc13992860f1a2c4ef18b0cc9deab06424e79 SHA-256: 4df68fc366da63b5ce301526091ba09c396e54d7f1154cd80d8f0c7ee5d34593
164 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, indicating a high probability of malicious intent. The PDF contains a link farm with numerous external URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of urgency language further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aaaexpressheating.com/userfiles/file/texuvinifubu.pdf In PDF document text
    • http://jnafarms.com/clients/864068/File/64568072657.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bb7604ae076bd292b4a79e99797fe721/35245202336.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa72c10e20---xapajugadunanazemim.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7a8f38467---84548378269.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c99c26595---togabodusasu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/2a5ed80173d20af9bf1724917965babe/51857366066.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32364a29c---borefejizu.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fdc63977f3b92f01ed62ed7747ed9c22/riput.pdfIn PDF document text
    • https://506hlapeta.com/files/file/89775980322.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/99136441762.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6adb19929---nivopinoxojigabidixodoza.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3ab1b144---negamez.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9444dd2df26d9aafe8d35a69994969a0/93010174516.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/17393492431.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/kasebujesomasekejudotu.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/3026587924.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d9dc0ae4---76707888266.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/sepanazelovabizi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a70cb8e3f9f---pajiduromatetugefajudi.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/27704380214.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/43738651845.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/33370709696.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9ba5174a3a91c4681a1e2241d8036254/87378884036.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b461249f7---27160998074.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/81705645519.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ebkp4o80gqh204r19m9tdmp2r6/31639832630.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wavebanunimabamas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=homeschool+questions+and+answersPDF 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_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 10956 bytes
SHA-256: 257d67093606221183910dd51794b3a56ec65a37aa93b2186503faf1d29db432
font_01_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 17324 bytes
SHA-256: 9f79ef4cbdcef17b8b006c70ca39a6587caf57c58dd0f3d7fc4f5517d58f3d7f
font_02_sfnt_off00014d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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