Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e47b261fcc5942…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 20:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c718aad46c00f2f6cc63904078685838 SHA-1: 638a4b6629cbcc206e5c4d1ab7c59caeca6e71e5 SHA-256: 05e47b261fcc59429b03570a45d2a5db9582aad001408e5d1620f9c5d3ee9c97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://erfaspot.com/resimler/files/lodavuzo.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646253459d---xedejojokew.pdf
    • https://alate.org/admin/fckeditor/editorfile/zakugupebevojakomazivas.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f4f7d01b3---7400301095.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972386c467---34882974715.pdf
    • http://crescentcarpets.com/userfiles/file/71264788804.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087384389a7a---66878013398.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rigm2m5ergdhlqkepsub2knp47/lubodorofisutiripurageme.pdf
    • https://cissud.com/uploads/ck_editor/files/wapevatebu.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7878f28ad---tubutabegun.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/26453856376.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be24691273a---ruparusafiludorulapeja.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6e32db6648bb3a0c8104d72fa406711e/30738852846.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0aeab9df7---sowegu.pdf
    • http://classicalgardenstatues.com/uplds/file/45979751929.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9ced1146---luwasotunamarubivigor.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e68f25cbf---dugogejeg.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/b4ff503092c526510e6eb9f3b3346a1e/63059904600.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5066214624---xozidokuxibalogegokuwixal.pdf
    • http://kulturazebrak.cz/userfiles/tudifikugewafinutudud.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b370f014fbdbdfa5efe3f9e9b796d1a9/sezekotadaranoseza.pdf
    • http://wsystem.sk/userfiles/files/memeremuz.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/funekus.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/wezenobajixak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=open+protected+pdf
    • 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_off0000ef21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 16792 bytes
font_01_sfnt_off00010738.bin
b0be883ad332f3ae883d89892a4de9441cd1f5441b9ff0cdd47624bc85562447
pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 10172 bytes
font_02_sfnt_off00011e0f.bin
43ebd60eaead304290b276352156e58917a889cc59467f2ad04468326a807472
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 17276 bytes