Malicious PDF — malware analysis report

Static analysis result for SHA-256 310584e8f94c8eaf…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 02:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 234b4175a4f3253cfb7ae84fd4f64802 SHA-1: 3afdb676c5dbd3fec04db1139eb21674d6baa1fc SHA-256: 310584e8f94c8eaf6318484747da5119d126ac8ce6df336df4a8517a3acbc257
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are flagged as compromised or disposable hosting, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ytdrive.com/CKEdit/upload/files/fawapolunisorapuxulewi.pdf In PDF document text
    • https://chulintemple.org/CKEdit/upload/files/zizesokog.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/padimuwufogixadix.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f203d4706---58624196279.pdfIn PDF document text
    • http://unsersohn.com/images/file/67325442582.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/kifuvigeta.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/81095045006.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/wusilatinawiwududexikin.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/6339664122.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/11764545722.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/lavofuvuwoz.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/091b497c76723e9197ac50137023cba7/taderuneponotivewiritiwi.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/86012834993.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/1233833403.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/65339613588.pdfIn PDF document text
    • http://zamgph.com/uploads/file/091015122858.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xinoxigul.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614598cd29b9a---gelimila.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/12698957922.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/ditidibiloxofegiwinegag.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/3921707711.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e8018279fd5ffeafeefccae164dca1bd/63969828017.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/77776599372.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/25903165164.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/nibajelexupu.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/bojolawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=xmodgames+android+apkPDF 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_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 18676 bytes
SHA-256: d7839ecfdedbf493e13f84fbbd8f973c618fdf230894430dfdf97e6441fd2c41
font_01_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 10688 bytes
SHA-256: 0082001f316eba01cca79ae3cdc2938b39e817d64c60a7f17dfa8444c2da3b08
font_02_sfnt_off00012c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1