Malicious PDF — malware analysis report

Static analysis result for SHA-256 373cb214b4e39c11…

MALICIOUS

PDF

98.2 KB Created: 2021-08-09 23:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 862442a69af79aa8ce9e05351a2a09a5 SHA-1: fb46b3142bfccb7da152a73406156f8da719c3c0 SHA-256: 373cb214b4e39c11575fb3c3725efaf6234189669cbde89492d87c4a3c30443d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a564520a410---63842003888.pdf In PDF document text
    • http://unicorn-furnitures.com/d/files/80529950272.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/99793272683.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/96042150324.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1627084177.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6934418c5---49059135359.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/88588922538.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/266b3ae858094d88dfec682aae2f95e8/84698467324.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/mf7l0vi3sakdkstlntpbkq9r0o/rexuziwowufajofes.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lc7ot0sr561psrrb2d17m1b64n/rorobiginabudovafuv.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc47f5de45---wepidesije.pdfIn PDF document text
    • http://954move.com/clients/4890/File/63372804388.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729de7c19c4---somoguwiwo.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0e71deeacc---kamatisuk.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/26729988160.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/68891699404.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/4809516992.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/divokam.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8931031f6a---36776034471.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/tojanotul.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/99jv7ju7jhjse98vl8qvet4t2u/89739341516.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160762eb865b79---96597124793.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/xevodapuwimulep.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/wumipewanup.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nelosewalepone.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be39aeb8d6---25605908923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=catequesis+sobre+el+pecado+para+ni%C3%B1os+de+primera+comuni%C3%B3nPDF 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_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 18384 bytes
SHA-256: d8d69055fb7d48fdb99ed42d6706ed955ed2d4b6cd2b5e7b6d11089cd2d51f05
font_01_sfnt_off0001449a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449A 11436 bytes
SHA-256: 5c85a156030eea7826fc1260f62f118a87696f3c64c7bc3d45055a147363cfcc
font_02_sfnt_off00015e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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