Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bb0a8287a917fb…

MALICIOUS

PDF

83.5 KB Created: 2021-07-12 23:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45c89c6594ab1204828c116948b8f70e SHA-1: 2250e479871c2d077820a2a16d55310f1bcba6ac SHA-256: 54bb0a8287a917fb988f613191c85c0bd30471267cefafad063942f8584e8fd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

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 http://happypalettebnb.com/CKEdit/upload/files/besibewizivubum.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4679554360ceba77cb6637c9fea834fd/50874440704.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad62f5751da---1253063604.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8fbda1859cf004a0add529ceb76818f5/jepakebina.pdf
    • https://prtl.pl/userfiles/file/61037942444.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021612100495249.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ultg2h7grj6gpr9nsov3orpuif/nusuridivalisazifutaxufo.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cdc318502---sijomatun.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/60aaf1ee026462d25dd881f1e206cf3f/gisipab.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16071812c0f46a---44049102562.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c454d92bb32---xifinepotowimesubozis.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094266d09c52---64299331771.pdf
    • http://botosani.ro/img/uploads/file/36270756064.pdf
    • http://hainfelderteich.at/18938737005.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e18e65573---jufedigevurubapetaroz.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/7hufbtl527tga3iqjfuktqed73/fifajakegifer.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/beluze.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e2082b7---jepiwowinuzovenegilosav.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6434427b8592a69d437ed8a062023eb7/65625786383.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/715493ee38373a483dd46b9d77fa5348/jowapewiwalomef.pdf
    • http://colorfulmedia.de/fotki/fotki/file/neguwajemigis.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a438585da32---rotafaxikovifudabe.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/650a1b7fa071031b207bfdefe7e25614/84793195740.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=obstetrician+public+hospital
    • 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_off0000e523.bin
12470d0c2c43a457d9384b244c03a934a882cad1de82f68c1a34ca78af3895b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 16788 bytes
font_01_sfnt_off0001107f.bin
a375f2ac3766a98ff15779352fa2454d2f2de7eca7b2b0332ad767f18c9c6cfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 10736 bytes
font_02_sfnt_off000128f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 16792 bytes