Malicious PDF — malware analysis report

Static analysis result for SHA-256 2196aeb627e26918…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 11:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ec144ec1a85db1e72b0eaa0972bf97e SHA-1: 99534b7ab8eba8ca2c4524ec6e0c3e38dcc236ce SHA-256: 2196aeb627e269181096174d410e0c0538224a96b29ba785c85071ac10af43e1
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wumag.pl/userfiles/file/93349061800.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/rosusama.pdf
    • https://viadagio.be/userfiles/file/safepetoxatelisebekon.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/61444283574.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/39562582744.pdf
    • https://cubic.is/userfiles/file/jofekufuxid.pdf
    • http://kripasec.com/userfiles/file/tamejetajapebalosa.pdf
    • https://cailux.lu/userfiles/files/78646856409.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89ecb1c99---rubevazizezodazutu.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/livujujedaxenipexak.pdf
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/semefim.pdf
    • http://sswjeans.com/files/xalopiviv.pdf
    • http://kuppersbusch.hu/userfiles/files/11677846836.pdf
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905163450.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/65228100857.pdf
    • https://onderhoudnlgarantie.nl/upload/file/82525240694.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161399ae188048---32532813556.pdf
    • http://aaaexpressac.com/userfiles/file/29117406986.pdf
    • http://vet-spb.com/userfiles/file/xiresesaritegug.pdf
    • http://sfipl.in/userfiles/file/xigevu.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e78540c48---33216978973.pdf
    • https://lotteppta.net/beta/assets/file/zagedazagukifate.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe8aad86e---turegikoluwedapid.pdf
    • http://artc-polymers.com/upload/images/files/bemuripumawiwudapiraju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+connect+wifi+on+android+without+password
    • 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_off0000cc5d.bin
bc66f28331f3084420a18a738e0c5b3b811193083f4a3ed28bd5a39f62da4024
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 17620 bytes
font_01_sfnt_off0000f9e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 16792 bytes
font_02_sfnt_off000111f8.bin
f072737736f14935af3f3578e403a0239785362980e6c88d3fe4ec931417671b
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 10848 bytes