Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec042acae0eb7f5…

MALICIOUS

PDF

74.8 KB Created: 2021-09-23 04:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cc4bda35dede2eb292b8e8598b6ba38 SHA-1: 26db3e289b7da3ddad06e717df4c63690a30e45d SHA-256: cec042acae0eb7f5ffc5a92dbb1814db2479b594356a67fb00fdbf209e26aa48
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised domains or disposable hosting. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pk.mo/userfiles/file/dawupuwudikozukuxajumuzi.pdf In PDF document text
    • https://arch.ua/ckfinder/userfiles/files/volopo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c090255b---fapolif.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/kijulirigigesipijumubo.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/76774247959.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/49149405770.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b92e6e6fd---wopewikakujiwe.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/mipiguvokipusiwowirowore.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/gabava.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9a949206---44021787465.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210907062706.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/75364750592.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/nopozi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jma3lp0uev6mol29rokne2421/monaferakubededetupijow.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/jodowitefu.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/zujepekumabapelubativisag.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/78183217897.pdfIn PDF document text
    • http://entrackintl.com/uploads/42878018722.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/1844524658.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/12822771774.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/36433741013.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/riteloviporebijij.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f7ee6f8b5---28250462459.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/lofifovi.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/44617377061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+use+cameraPDF 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_off0000c030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 10468 bytes
SHA-256: 64b68e119b04881a30163f15f631a1585649000feb30c3315ce51ca6dba0ef80
font_02_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 17668 bytes
SHA-256: 29679c5b1d135689eeacf8c4cab188304d92d1e6ec1c73cd3d51558fddc5105e

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