Malicious PDF — malware analysis report

Static analysis result for SHA-256 85db313ae5584dc8…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 00:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25df0ac74681cc1eb48bdc775b97f167 SHA-1: 28ddce635f617fc581e39c7a5ced88d7ead04de9 SHA-256: 85db313ae5584dc8b1fc2b7b51e063f64263e7821314d1038bc26c26d836deca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URLs indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+do+i+see+who+looks+at+my+instagram PDF link annotation
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/43bb352e259a38f721bb5575df093293/62904956911.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/xesusovitabekikadota.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/86908231100.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/50066532309.pdfIn PDF document text
    • https://mkart.it/uploads/file/giriko.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16150b013c78bb---jekuwuwisuluxutoniv.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/82492312508.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/xabeponenidaxijomutudit.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/xisemeguvigewuzofawixi.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/luxosovekikidu.pdfIn PDF document text
    • http://darstin.com/userfiles/files/talupopu.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/fisedafu.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/raroketamugiz.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/gupukeluvemebibisi.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/gutetipurusugenazus.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/19537582319.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/81660477615.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/92897536951.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/sokivujeguzom.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091609584925.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/90860936976.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/newisovele.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/s3a7dcvs8dbm0mbaeg4dm3vuvf/64311683574.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/turetusewoxumewogasup.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/70958048225.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/melipifekak.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/57781408916.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_off0000b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 16568 bytes
SHA-256: 0605bfeb2a140d66de90b0426081de76dbf8537c0914b875e2a861268437842e
font_01_sfnt_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 10976 bytes
SHA-256: 8b93541696b70c2afd8db25c07d20d8ee074ca29ade7f9e94b44b367232628ac