Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dbeac87f8e88968…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 11:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fd9a64adc7dd0f68e4a1434c8a38730 SHA-1: 75e85add4bcd7d21e04059031b5d4737d53aaab3 SHA-256: 1dbeac87f8e88968c11bdf6d0c31dfba02ddd4fbca915535f38037ab700ca917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://syuncyoku.jp/upload/file/85403615459.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/q334uckq8epodlbnped5apsku3/19680854704.pdf
    • http://foto-recepty.sk/images/fotky/pifawifulamizoso.pdf
    • http://thermocomfort.ca/userfiles/file/65364536649.pdf
    • http://presssimayeshahr.ir/pic/file/jajasuduxuluvo.pdf
    • https://hoanghaie.com/Images_upload/files/kujebi.pdf
    • https://orderpoet.com/ckfinder/userfiles/files/jimabu.pdf
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/zuzupixokujusonisi.pdf
    • http://surestegc.org/documentos/file/79897342564.pdf
    • http://reklamaopole.pl/userfiles/file/60500181520.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467cc1bd857---10138945913.pdf
    • http://ngocphuocjsc.com/public/default/ckeditor/files/91849521478.pdf
    • http://fuyu.010bi.com/ckfinder/userfiles/files/88515142907.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/gizowipozazexileripuro.pdf
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/39463680642.pdf
    • http://bebaldebaran.eu/userfiles/files/bogefegotapovux.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/56416599465.pdf
    • http://nineslash.com/user_file/file/88808895128.pdf
    • http://www.shjkyq.com/up_files/FCK/file/degurufirijibe.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/2982249304.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/810157c9bbc6fec6d6a9d4cd1e7495bc/21629708184.pdf
    • http://hiroshima-teishaku.com/userfiles/file/23724513491.pdf
    • http://ceskylakros.cz/userfiles/file/jasapizigolesozafibom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sinhala+english+dictionary+apk
    • 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_off0000d49f.bin
6907544b2badd34eb3ce460818fb02a123a3fa5b4ed29c0a0c20ca23fe36c675
pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 11072 bytes
font_01_sfnt_off0000ee1d.bin
a40645ad47d1e59fc15689148821b94612ec03c3bd40c916d61dfd5778c7731b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 20948 bytes
font_02_sfnt_off00012579.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 16792 bytes