Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a13e2fd2d5c473…

MALICIOUS

PDF

103.5 KB Created: 2021-06-29 04:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2aeb6870b4db4511ffbd88fb65ca397 SHA-1: 62e1a2c97374fff846d427c0aefb76c97b99a5ec SHA-256: b9a13e2fd2d5c4731922bb39085fe680f8cfbf0ad273770fd62309fe1c359b49
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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 http://suachuaspa.com/upload/images-content/files/50332336255.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6bf5846fea12a28cb2da5590c89adde5/53626015044.pdf
    • http://macap.nl/app/webroot/files/userfiles/files/44890834969.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/39rj3g0m49oh61d2noilsrs567/57087500819.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf67062701---mutoved.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/0mjrv617jegcmoq8hu7eu37ph6/59137068112.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8292a0749---75607729562.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f7b58b0666d6166ee9e88093c9c4f9c7/26194544224.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/dc44c94017ff6ade0078f22c40b47393/xogafadubuko.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/osbj2fslu9l4j53uu86n0nj7v8/6882099859.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/10b41322b268314be822b5209837c942/1000020997.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/35be091367724a79a147899686d8df9b/begiguwitalixi.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160767a9db9248---gitukegar.pdf
    • http://edgecs.net/documents/74401553627.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160784126b5282---sozux.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c922df4f6---ruvofubamodemozup.pdf
    • http://birzebbugastpetersfc.com/files/file/3352747933.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e21e30b5b---tawemuruj.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/f4sa57veud2c7b7g8bufkdskrc/92928203082.pdf
    • https://artenika.pl/fck/file/luxozixojafokituk.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7mbs2802rj5a0pjtm9sq0av9hk/gonezokurepetowamelim.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1d6bb6c6---baxolodusosikakozifoxage.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88a7d5d33---55683787210.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/57768df43c0056a787190799498da7a3/pofinidiwikexibabamapas.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e92de8a0---64454976428.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+and+the+deathly+hallows+part+2+full+movie+putlockers
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd1.bin
e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 1784 bytes
font_01_sfnt_off00011636.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 16792 bytes
font_02_sfnt_off00012e4d.bin
46282fa0cd7635bffebd89198dfb728b03514d9c8e4daebc6790aaa49e227717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 11456 bytes
font_03_sfnt_off00014943.bin
0e30b3e3ca9190133f135199fcf5c68a60e8ad1f29bb4c4619a54c2797ca056d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14943 18052 bytes
font_04_sfnt_off000178ca.bin
d7cd55395ca8c5b3ded2e9f44cdcfdf374181edfe397b2f4d7fa01d4c9eac515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178CA 16280 bytes

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