Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7fb9155f056282…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 18:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e503857832d2b68ce48f13950e6b1426 SHA-1: bc438a8255d0a1c82e9c77405cf79f1ad3982b02 SHA-256: 4a7fb9155f0562825a277b87d40d788323bd79fe75198e0fa7884cc289b44f01
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using disposable hosting and compromised CMS uploads to host or link to content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/00c254561e642bb1d743c98394cd45a4/98356476903.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a3e9977994a928b38ded6b6ab7cad39c/jebomosojerekuzunekuzi.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b71d396dfce---funafekosujaxalababiv.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/q1s6tmqqed62oa877gor27nmup/58087330126.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//7758156508.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f025b3109---19945940056.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607035b76abec---93661548240.pdf
    • http://haithuanphat.com/uploads/files/21111999012.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a853197f2bf67c9cd2daa022977f5743/tademav.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/20755396172.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95ea3695ce---niwefirafakaxunurax.pdf
    • http://webursitet.org/Files/file/totuxar.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/s7oh9t4sh3bh4recf0ebovrj5t/dituwobozojapobilerofix.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a50663ed77859e6bd346ef2f8050dbcd/65948700033.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13877bb33f---25536225818.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53952829226.pdf
    • http://vitanova-cattery.com/upload/file/45278828087.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-6-27/20210627150638293419.pdf
    • http://alisawedding.com/upload/users/files/tusuj.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2cbcfd17c29f1c6c68f2eb1e2a94487e/wepefuzosabivuviropu.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/12352889528.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb40b7e52---63486077757.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43727679c---43712675040.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=waterfalls+in+east+tennessee
    • 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_off0000eb15.bin
e46de72a48fb5e15fcf1f3d30f0e3e1ecdf51650ce250179ec01cf7c8a8611a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 17224 bytes
font_01_sfnt_off000117c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 16792 bytes
font_02_sfnt_off00012fdb.bin
e3218fc7ccb6e6431eb53cef2d38609df30cb1e7724d0d68eb5f8ca4d57fffc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDB 10080 bytes