Malicious PDF — malware analysis report

Static analysis result for SHA-256 81daeea1170da6b0…

MALICIOUS

PDF

103.0 KB Created: 2021-07-22 11:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f3790eabe3bf0a4b7c541661d2c7632c SHA-1: 23db60e7e65b16f14caa23e3aab34deec0b8043e SHA-256: 81daeea1170da6b03610ea8f0f83fd3f6c9f6d4116521a2be6e2bc48c2a96ef7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are designed to appear as legitimate files but lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://ca1970.com/clients/10044/File/jisemazovetuguzezux.pdf In PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/pozabixojazavamoraxukufaw.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ad65641684a---fagorilofutabalizewig.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/15611404651.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/39713332702.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2uiv1lv6jn59023na70cfrn6q1/42562008586.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/39299031357.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/dubakuxidepeditip.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/52569696179.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160730f47b89ab---samapalewib.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/savixa.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/140435010.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/puwimuwiko.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66085912645.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d36ca4f3f6---xixilaxikasege.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160976dccdf359---kowiparemuse.pdfIn PDF document text
    • https://ckmandarin.com/uploads/jaxoxiwubiwemudokakowulo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a3lf8fg34sok5n96fmhvo17hi8/femituvizofazox.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6unmh0u57prh69sskaa0117ihr/nakaxalazewolen.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/73295391830.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2422f7279b---7334607436.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///tikekupumopu.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/21860474493.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705db19dbba---nevozip.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/27979615e966f880ac7c74bdb7be98c9/49327184323.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/kht48fhiu48u23vu300aa1u201/duboxijimibamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=to+string+cPDF 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_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 10028 bytes
SHA-256: f2e6ff481f453236b6219ca8e76ca0f8439ed2a60b38aefab89f1076332feb08
font_01_sfnt_off0001428f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA1 19292 bytes
SHA-256: 21e89055e9451f62d67e565caad79e73634480c553bb240d5d416798585b600b

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