Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae55ef1a681f0cb…

MALICIOUS

PDF

92.9 KB Created: 2021-09-16 20:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78650c2f1300db1a19a47ee51ef267da SHA-1: b607a6302394da219dd675bf1c1e9ecbea5f1b5e SHA-256: aae55ef1a681f0cbe86fefd38fd5e7c631c555727ea0c49d9b88b8fd70b6c2b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document is a link farm pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ateliergermain.org/sites/default/files/file/kokubiburuvuzoxixisapu.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dadc020ac908e0b41ceee1919c682d63/difokeseku.pdf
    • http://cdenito.net/userfiles/file/81177105282.pdf
    • http://ilkjv.com/Images/Media/files/nijegigogixupimo.pdf
    • http://bafiti.com/sklep/userfiles/file/41643871636.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc798deb0---gemubugivigatopevili.pdf
    • https://styliststudios.com/imagesTE/file/jaliguzu.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15245808b---31798233043.pdf
    • http://ubest.ru/images/file/gaxeretamabik.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/tujavijinelofumof.pdf
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/jamifixepodilijazifafu.pdf
    • http://amsuatrust.org/survey/userfiles/files/65968127940.pdf
    • https://adikketiga.com/contents/files/ripenopa.pdf
    • http://dulichtantai.com/files/uploaded/files/ropoli.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f32dd54d6500d46cfa957e0e12369d27/86803605534.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a9a0b22e2aaf8574fc05f0abf3fdf9ce/disosazowofidisexisav.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/14547526849.pdf
    • http://ginzaoakland.com/uploads/files/79329081788.pdf
    • http://silarperu.com/UserFiles/file/wanikitivenepibogivemipe.pdf
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/30727746272.pdf
    • http://hoteldanang.com/uploads/images/files/koriritenogupilazo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kevin+randleman+infection
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001037b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 16792 bytes
font_01_sfnt_off00011b92.bin
3d50b348ba9b8cf31a0dffebb14d747f95ec47a2d86e41eed9ae08df1a33b673
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 10528 bytes
font_02_sfnt_off00013381.bin
432983bf92f4b374674b74c3af9a401d7954a2ee6132762356da5bfae55241e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 19316 bytes