Malicious PDF — malware analysis report

Static analysis result for SHA-256 0073b2883aaeb140…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 15:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dca91e09dfc1f246bb6334cc349adcef SHA-1: 118a18af46c635356e4dcd2057f631611bf77006 SHA-256: 0073b2883aaeb1406634da7e6bd7b9dfe779b7944ef79409cf5cd1a4caea51ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a link farm on disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0880be0ea---41507356651.pdf In PDF document text
    • http://canoeing.by/pics/files/fizixegelojixasasa.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/jirafos.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/118504d3b86befaa6d129af7201615f7/75742729468.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160942f7a34044---kufopuxududiko.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/fuzefoxiwegadodadunedume.pdfIn PDF document text
    • https://aedwea.com/upload/foto/55322477733.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/5018711402.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/sotepotileputepafik.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/26526977592.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/xopojoja.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ee3c8c51---68978478116.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/wazobataxiluturele.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/viroluzetejanazugirenuxot.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/pifedole.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/jimetowipibip.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/62942087628.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/xoxirugaditusizu.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/donasodobukirizad.pdfIn PDF document text
    • http://glttek.com/userfiles/file/672226055.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ce19398669a7c61ce783d9ea0dd80824/46932945130.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb316f976---36451947084.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/62818185432.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c0b4c7df1fa006f617c27f5eb4719d16/50629574672.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d70c1c5ac---41367149729.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/74865947858.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/r2n62jgsmijm8i7plgd0hrjgh7/17905755018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=upper+intermediate+reading+comprehension+exercises+with+answers+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/getokajuxafalulemat.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_off0000ce5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 11216 bytes
SHA-256: a00df8e59560b51a4b348fa44172c8bfc6a987bd63837904bafda4973a084c2b
font_02_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 16576 bytes
SHA-256: aa003162a542dacc40ccce33d0aa93ca48fbd31c8d5dcc20af04a400d55e5e39