Malicious PDF — malware analysis report

Static analysis result for SHA-256 8495619876904d1b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 08:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2886d2ef3529944b364a07ccd26d71a7 SHA-1: 48112add9d960071637708218587dfd9864425f6 SHA-256: 8495619876904d1b257e3490db7bdd1ece7bef1f0de44603f24e6281175d7838
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites and disposable domains. One heuristic specifically points to a raw IP address, suggesting an attempt to bypass domain-based security measures. The document body is heavily obfuscated and unreadable, but the presence of numerous external links strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://mavachhaiphong.com/upload/files/86103264148.pdf In PDF document text
    • http://evolutionchonburi.com/userfiles/files/47112907191.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321aeff2e39---toregifas.pdfIn PDF document text
    • http://terlickodds.cz/www/www/fckphotos/file/wifetazogajerumidin.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/24599888626.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/396528620d3ce0ae609383356dc6dcc6/75973548349.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/vitojenezinaxotasigerigo.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/vunajutepuzufago.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210912071140_nxg8mn.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/lilebelojo.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/23463144182.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/gidebivimukupawo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lalotudura.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/kafanuvafojolujove.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tojoxokubagitofokigivofin.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/4645675854.pdfPDF link annotation
    • http://old.smartplus.pl/ckfinder/userfiles/files/winewizako.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aebce6c4cc---vaposovejimowujewaludefog.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/25800200547.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/78089211268.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/sofazoxedesitetexumor.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8866398a---21166910957.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/14754768352.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f504ea45f655d6e9a10c29f7279c8632/69745013883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=7+ways+androidPDF 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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 17504 bytes
SHA-256: 49ab4a19a12b61ce9a43aed619cf620c97ae2fe59fd1e46287d8f50e277bc9c1
font_02_sfnt_off00012dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBD 10120 bytes
SHA-256: 414e8caf1a54bb541cbd8b0bdb12867d076512e90149112e99cd174a1d9bf769

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