Malicious PDF — malware analysis report

Static analysis result for SHA-256 80196528279b476c…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 09:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c2d1082901bbd352ec765a4d0740d189 SHA-1: 297ea0a1ab315debdf399cd9c76971f0fb9823e8 SHA-256: 80196528279b476c44b4d59cbd0ec7e65b8adc3d7c205ef73a888012f42fb974
116 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ae11ebe6---95068723920.pdf In PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79817027d---82626101598.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/kilozewil.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a81bd4c60b---58805772949.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v03vv74tglnshrbtomnqtp55v1/98207601380.pdfIn PDF document text
    • http://waterreducer.cn/d/files/93742645298.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a14fb3d50abaaf88519cd3340ab7851/61720352466.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa7997fc86---kevuxotusejo.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/1746966067.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/66439133974.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/875724884.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608658b6d7bad---57933499778.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/20525736649.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/10102895669.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65c3907093---zifafuwaw.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b1854819f906ec24d933ba63007b017/98616572509.pdfIn PDF document text
    • http://127.0.0.1/kardelenemlak/upload/files/gositum.pdfPDF link annotation
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160878e9ac813f---mejisepuwefin.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c31237d583f---redigopelaxifopajuker.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b831f3e3a7---guravuwufagag.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/43540035361.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/nususesupulamomilirakofo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/mr09lubv819cv4ml2io3js8gpq/guliporomi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b8e6a0d3---dewixenamijutukotisutulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+increase+your+arm+strengthPDF 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_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 10924 bytes
SHA-256: df4a5d1c8ba20ebe02612f5626dc952448131fbc0d7799e7e52825b2e31e7797
font_01_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 16572 bytes
SHA-256: 4bfa87ae61f7b2c624627869550a972ab5f05671974af41e849377b87d3b7fee
font_02_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1