Malicious PDF — malware analysis report

Static analysis result for SHA-256 43decaa46555be0c…

MALICIOUS

PDF

90.2 KB Created: 2021-07-18 14:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7860bdef0c05a76c4178c3e52977a930 SHA-1: 8c2641bfa020072f77de1306ef01de7b39b30074 SHA-256: 43decaa46555be0c46c6338fde0bbbe4caf8e14ee5ef98458c01b40c718a21ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary function appears to be acting as a link farm to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://99hospitalitygroup.com/ckfinder/userfiles/files/mugesutewurabajad.pdf In PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0ec9d23181354e39f2c20b1ab99539da/93962415810.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/mozefar.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c34561a69---tumimuz.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e65aa0a70ed2345ba5b57314c32e4166/49886686790.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/vikowufubafoxalivofumurev.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5b629aae---14351907713.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/76f7ccb1b2f6dea9578240f649357b8a/vufinexazegibidogomijawaf.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/45399092224.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/88976965073.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626561676.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/12736ac63c8d0e30906f737ba6a04dea/19621282815.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/dewomun.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/10b9a7970f4f5d2f61c7212e9e78a4ae/fiwikojidemevipit.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1627b212fd---xigidife.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b1a5860c---zejatufepuvusoguxivo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1c67b8e6---kapudumu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/86407852503.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/9750332944.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/21919945023.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/nojaruvokefatejaneb.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/83591828323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=argy+bargy+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ca19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCA19 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_01_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 10256 bytes
SHA-256: de540a491bb3c5f34b0cc9e7a9ff5279803e633e16d7bb0ed3ec0c1a6a316708
font_02_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000116d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 22144 bytes
SHA-256: a51b0daed842c53057800de374f34a2db176b4851f24758bb9b48f3f29f92c7c
font_04_sfnt_off00014d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6E 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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