Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf0613d080aa490…

MALICIOUS

PDF

84.1 KB Created: 2021-07-10 02:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81ff4ed136b1bcdd1ef9a023a8122742 SHA-1: c4d3ffefe41d804533d9ccaf36fe5658e8b66c4e SHA-256: daf0613d080aa4907e46b2b712e716614069557f44bdd1f7a2f533073c4d0a91
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage and a visual download button lure. These elements suggest the document is designed to trick users into downloading a payload from a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6fbbc9a1---ziriwevofujewim.pdf
    • http://werkkledingverkoop.nl/images/docman/files/82390224551.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/60a4dfc881fcd7b945cb2243891691e1/pejigekilorupokuj.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4f89dfac97754fa3d6b5f79e6539ab46/kumurekodozi.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59bf9b70e8---37423311311.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609895652f4a7---1404420298.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/38eh589m2jimvl6pd2654rp0gg/96191205033.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a68e071987519b6b5127f44bfc13a81c/maxizena.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00d677b7f---dalaleje.pdf
    • http://montaze.org/democms/userfiles/file/sekavubuj.pdf
    • https://bucatariizidite.ro/printuri-fi/files/fugajexupovodifaman.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/00d7ed0831d511c4b1dcfc67a3373525/gikiru.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160adc7dbe0ff0---naxokatobexulakuzuzo.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4cfaa5ba---16505198908.pdf
    • http://itfind.ru/uploads/file/90630313341.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/accee4dd41b858b3524c42cb838f99db/detawakur.pdf
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/5327639721.pdf
    • http://matsonconstruction.net/userfiles/file/82259989911.pdf
    • http://brenno-tojestto.pl/userfiles/file/98557537876.pdf
    • http://delve-cr.com/uploads/99468833487.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/203f87e15d687833b430f74e83123b60/jawemijifabibozor.pdf
    • http://aitrans.org/UploadFile/file/F1202105110305291112.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c69026a56---66264122810.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+autocad+2020+student+free
    • 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_off0000e337.bin
7134de3ce7cd37812610bdc15068ba75e8bc349a59555f2c735c94920baf9034
pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 10808 bytes
font_01_sfnt_off0000fc70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 16792 bytes
font_02_sfnt_off00011482.bin
c03ca2661ab42e3d69bda57919ca7902c9015db538df9c178a7b4bb16bd70a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 17676 bytes