Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef16bec8b65a2baf…

MALICIOUS

PDF

92.7 KB Created: 2021-07-21 05:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0db3c31cb68a63004c8a20fd79d00e9b SHA-1: f4fdb364c3542127f5b2c2ec76cda8a33ba4c27c SHA-256: ef16bec8b65a2baf9f70ed6d6b73c662cd154016e22df62a79b4c415829c940d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, specifically utilizing WordPress upload directories. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine results or lure users through deceptive means. The primary function appears to be redirecting users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48ee373b2---15052715587.pdf In PDF document text
    • https://notrepanierbio.ch/userfiles/file/tipovupawuxipi.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/retipupunamigaxulavufede.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/14531546241.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gj4gp4qjsm370r1hmjbharmli2/dafaz.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/48353392985.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/fcee59222d822e9ca96eae18fc013c5a/82594386114.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/xamonadidoxuwowidifu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9b16dda04---79031274872.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/fudawevisarapoxumufunusi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160da08432c130---sobulona.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/35f2g85p6hmfto5g0ajsg98u61/vanugegalemarudujumibaj.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/dupumamerugokafiruvupe.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f08d2d2b6---wapal.pdfIn PDF document text
    • http://simonide.org/userfiles/file/33268122504.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16079419c2c475---63532278247.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4117274d86---48983190015.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/38637097810.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/naxalata.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210605_B8AE9E9E885C3F9D.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160796f3c95df1---3270411021.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de8028a9602---popesajanokebow.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/19816166123.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/putirapenapilotek.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/88s75ttd4ecmdloh4dbho79uu9/23300688107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+power+of+critical+thinking+5th+edition+pdf+downloadPDF 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_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 11008 bytes
SHA-256: 6bd411520ec3c8bafe6db248d84eb41fbf0262a0378ac743812bee65ba7796ed
font_01_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 17436 bytes
SHA-256: 60d234f155fd39621549e970eb4beaf56aaa58694efb31f0c3708bbc131407bb
font_02_sfnt_off00014ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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