Malicious PDF — malware analysis report

Static analysis result for SHA-256 608152f2625a4ecf…

MALICIOUS

PDF

94.1 KB Created: 2021-09-21 08:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69bb230c50a596db852abf554c7922e5 SHA-1: 34bef56828128d16d332380b458684e85e241e9e SHA-256: 608152f2625a4ecf3021214c9eb9dd66a574887b97169498e2e0f198c86f7ecc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://meimagedance.tw/ufiles/files/rexekefib.pdf In PDF document text
    • https://sinarlangit1.com/contents/files/tozivegix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b8cd9c67---87947093388.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/15353475144.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161491fcfe0b00---32047870326.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/85516248994.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/3943943240.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/sixolafizuxiniva.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/fixumufogerumipidike.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/xovajunegevuguwefuso.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sozelolitalux.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/44239436233.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/bumimozi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/15745185300.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/zodisopudamabituxoli.pdfIn PDF document text
    • https://htchninc.com/d/files/virasamupiwagez.pdfIn PDF document text
    • http://prestopc.it/upload/file/kepesifasavamipuren.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/30344387793.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/gijoreder.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/damogigipovig.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/kozefibowifarud.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jalasunevun.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2e640be04---93083586287.pdfIn PDF document text
    • http://bubb.cn/up_file/file/jovasodolenagami.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/dejezavorokajepebafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=yarichin+b+club+roblox+song+idPDF 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_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 20952 bytes
SHA-256: 3612effe25ba57d2b79a244012d7d0fe6888c2556468cd253ce39a86e3af46fd
font_02_sfnt_off0001523a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523A 10744 bytes
SHA-256: 77f531dc53f1e904dbbcf627236ece0f251bee342024bd385f4937c105292f7b

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