Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ad34e19f620402…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 08:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e279e778c08e9de96950c271bb86e51 SHA-1: 9f514e1948a1e28ff4e5d77e4b21fb43c48d05ec SHA-256: 36ad34e19f6204023a0b45d604789aff478b78dfe77d227b8f2dbd74c2d12197
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many external URIs pointing to domains that appear to be compromised or disposable. The presence of multiple PDF link farm rules suggests a deliberate attempt to distribute malicious content or phish users through a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://allytemp.ru/uplcv?utm_term=date+picker+ui+design PDF link annotation
    • http://buydecor.ru/uploads/files/96639936880.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/84347186850.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/kitulojutomerefexe.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/67795914696.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/54c89a12c906c1b6a04df0adf76b1ab1/bejusijibepoxumin.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/bexosapofuju.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134135338697---ropabujekogokewi.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/fugoxarosuxa.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/6192264082.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/75594541076.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/39830582744.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/mexiwubukojoganizadujaxo.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903100807163403yone7cyc2tnu.pdfIn PDF document text
    • http://mousike.it/img_ins/files/58231107697.pdfIn PDF document text
    • https://tarsiman.ee/files/file/kafegi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613292e6be92c---vizilivak.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/54263719355.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32194666775.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/64766126847.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/gikife.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161350c6430cbf---67577771805.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac97a5e5e---35174609541.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/puziferetare.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/lobax.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_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 17920 bytes
SHA-256: 57696d61e78b4e089e2785ce82e8693b855715892330c5fda7c1124e8b600d51
font_01_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 10716 bytes
SHA-256: 064d6fb2d75b212d6643d7907882f21690f6c2387f4dc7451d23571211ca089d
font_02_sfnt_off00012e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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