Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3f560dc007c485…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 12:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3fe779d13d7530fe78b54a968af4e78 SHA-1: 0e2dad203739c1f7f0b61d2e11f9f6736b1c1696 SHA-256: aa3f560dc007c485f1a3a73737cdfa4b71af838b402af0f7a550067bbad91cd1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs and link farms pointing to external websites, many of which are hosted on compromised WordPress installations or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=real+driving+sim+mod+apk+download PDF link annotation
    • http://185.33.116.142/~bbyacht01/upload/files/47401836742.pdfPDF link annotation
    • http://basketaci.cz/UserFiles/File/fuzozavurasimajagevefiwol.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/16753692627.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/zuzajezupipudaniko.pdfIn PDF document text
    • http://uteambio.com/upload/files/fewisaru.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/sedufugomowixuravi.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/nugoka.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/gamaxojetezoperanefunu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff4b3ad00---vomanedunitamepivupu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ae5064f6dcca974cd057e802a7ae4d9/sukaminolomoviwozix.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138821148eb3---37745137397.pdfIn PDF document text
    • http://mqskin.com/luutru/files/62107940372.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/kejalabobilesegigu.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/72025352183.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161416a2ccb906---difusikik.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/47925019262.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210919092021.pdfIn PDF document text
    • http://contua.org/userfiles/file/57518202657.pdfIn PDF document text
    • http://www.agot.pl/upload/file/rajejajamiwexudaketafo.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/toxosuzunakuwelejur.pdfIn PDF document text
    • http://519pf.com/userfiles/files/birenadog.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/37074392290.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/natokep.pdfIn PDF document text
    • http://vitcongiong.com/uploads/files/12353062350.pdfIn PDF document text
    • 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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 10928 bytes
SHA-256: 3c34859e6eaa67d6ba92221b3f97bef098960184c13c72e1a6c13bda81aa8a64
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 18264 bytes
SHA-256: 7193ad368c747a785078a661e8817b582fadab563a0be80391dfeac382aae562
font_02_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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