Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbabcd4448bff1bc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 07:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e221aa500025ab7c5456ee1740be54a SHA-1: c71276e5e64658b378ce644aabe6bfc02ecd48a2 SHA-256: bbabcd4448bff1bcbd5ef0238f80035b353ad42348be12fc73699ca00f49b09c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan distribution attempt. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://dallapietamarchisio.it/userfiles/files/gesenodupetuginolabuwa.pdf In PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/41542746576.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/demekimeradiramajevido.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/31262045400.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/zalurojugagakavoxa.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/mibuzoxipuwukubosibegegoz.pdfIn PDF document text
    • http://zuszdounky.cz/files/20507442955.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/wukaribugewofigadazudafo.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/fesanebe.pdfIn PDF document text
    • https://turbooto.vn/upload/files/denefebelobag.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9bdced9a93432e92f54008fc78dd36a4/79794453344.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426a9892001---39811163566.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137641cda2fe---31241159379.pdfIn PDF document text
    • https://autoskola-scp.com/files/bobebaxa.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/losodobame.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/44774509479.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130209a837eb---21198999588.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/tozavatubetutipasaw.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/51685672415.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/wofanofokutumadozabufivid.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/gofatepakubuxojibizo.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/bopivaxulugison.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+fire+apk+download+for+androidPDF 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_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 10380 bytes
SHA-256: 0f5d0857c322a2aa2293f613239700f661391182d6fdb00b990133d2c23f781d
font_02_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 17732 bytes
SHA-256: 0a16ca95e9dc18c084d48ae55f1bcadb3e98a784b2253525151fa8257133b143