Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2bbb7f86960823…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 09:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c7a8ed71f5263795706a731fc787a51 SHA-1: b01cdafa83ab28347f5b03ecf72286ed4132fe38 SHA-256: 6d2bbb7f8696082314ab449df98f42d159603db831a98cdf6143b01d38e689c2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of external URIs and link farms on disposable hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://crewmak.ru/uplcv?utm_term=front+camera+icon+disappeared+android PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a2c95961---6798889735.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/m64g0oluldnfg6vsc4tnlk8qu4/83751379289.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead38f2a51---67269050547.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/zesara.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/17105232402.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085351c28957---juped.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/427e8f31e399a3e7346533c30dbe4c18/300111036.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3b0948b14---wapapaza.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/wovajataboxogudivatoro.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/zoxanebavelujilamonowifon.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d417119214a---wawelabegekakelowu.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/12459179849.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a5213ee7---judoxofufudo.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/7871723560.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612436708b8a7---gigujesufowo.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/duwadakomagiped.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/30888115819.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/49189690034.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4e4ea249d---tujefut.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f21394b2f400408c8656fce6fa2464fb/pekerupewasixexavamozo.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/45784116727.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/jinudakajijoduzawin.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210606101332.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875293c45cb---fiveraxinevowabipoko.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b446ca5f194---21238441987.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/75522826103.pdfIn PDF document text
    • 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_off0000beb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB4 10604 bytes
SHA-256: 98ec333316de660e7e4446f937003d84a1668325d104fb113b783a643a782fc3
font_01_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 16060 bytes
SHA-256: 2335f0569754a798798f3baeb27ca1b22b9a923d4cfb7aaa5caac1a2367bbf11

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