Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ba706093daa48a…

MALICIOUS

PDF

74.4 KB Created: 2021-08-30 19:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d387f49b873d8729138cb224a9ffc2e9 SHA-1: f42987bd0e12f183fcd8dea363b4288492875f41 SHA-256: 64ba706093daa48a6139da81516fb431fcb3bbff44a2b11b040f0a42fc0fa211
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads 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. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=drinking+lemon+water+in+the+morning
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/sawekejamozekujen.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vf5149m3kf1ff9mk5mjkmcqd8m/figadigipuxofub.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/36bd3805723e75ea231be77acf8ec59e/91642324726.pdf
    • https://trsoftyazilim.com/genelresimler/file/53414265551.pdf
    • http://cameradungphat.com/uploads/files/sudipamosixinegiwafuxod.pdf
    • https://hoakhanh.vn/uploads/image/files/63679568178.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p5kht2gg6su1e3fgc52cu32920/dafuwobid.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5b82e45b---10380399005.pdf
    • http://tienhasteel.com/app/webroot/upload/files/28939496992.pdf
    • http://stressmanagement-karriere.de/userfiles/file/97188851479.pdf
    • https://wic-net.com/userfiles/file/vigiliwilagolipak.pdf
    • http://kpdb.org/userfiles/files/fivasawerakopixegod.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9f14bcb13ea825ce26dba42a9765668e/11139101129.pdf
    • http://av-jet.ru/userfiles/file/zoxipetugojebenovuw.pdf
    • https://searchlink.org/userfiles//file/lugudisabevot.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e36bc74a8---zebofeval.pdf
    • http://ridendo.cz/files/file/16818175244.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaad0a0737---ronufitafitok.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/31d1b965c5efdd5d426098b7b62457e3/93251597505.pdf
    • https://northwestconvention.cz/data/files/74664313340.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB7 16792 bytes
font_01_sfnt_off0000d7c9.bin
6f3db0bcc847ea823ce882c27a3b2ad5560b792c1fe0ee960b941a97b1022062
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 16940 bytes
font_02_sfnt_off00010391.bin
efdd953d05936cf40b5a2053e5d412d9ee5ad2eb2b0f6d5ef782ab9a380be687
pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 10568 bytes