Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2344eeec939c03…

MALICIOUS

PDF

93.1 KB Created: 2021-07-04 12:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fe6a64dea44fa40229b805654cd6ee4 SHA-1: 896d2e4d5fa92b4af55771324fcf9bc7efd8028c SHA-256: aa2344eeec939c03febca70157ba9b64bc8ff8f9bea69a654edbbd53b142df8c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3fc41fddc6d94a3aaa946be2404e156d/wiwulotokibupuwoli.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/sii6u6lekrjo5in1ig2qp0c53q/77888808132.pdf
    • http://chapelguild.com/images/usr/18481460445.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609069df29daf---vonesifubitefup.pdf
    • http://amirafouad.com/uploaded_files/file/rofasodo.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ae30107b0e0051d8580165fe647187af/26623215527.pdf
    • https://twr1115.net/files/fckeditor/file/728303124.pdf
    • http://aal.tw/uploads/htmlupload/files/zexitinuludaraj.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d6735c7dc---bebojemadozefijomumure.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0c2d1826---5263565787.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608109067e925---86899839781.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/ropamavaxatoziwevuweja.pdf
    • https://subarini.ro/mm/file/42333103646.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/34036656851.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7455c87c9---tegemitogu.pdf
    • http://peak-experience-japan.com/32753166308.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de693e825---95159484626.pdf
    • http://elitaliaweb.it/upload/file/fudujutizox.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac98d530cd---zifukitugagixuditisun.pdf
    • https://bajrahrs.com/userfiles/file/pawepizuzegizaladuwakedo.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761bd7b7167---jofixeresegemofufu.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e8635e031---pikixojo.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/fg1dud1lelog500006pf6pg4c5/28179839093.pdf
    • http://cesishotel.lv/res/wysiwyg/file/67590792506.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23f191265---98484948751.pdf
    • http://daiichilogistics.com/uploads/news_file/dudokodawigatipukenu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pronounce+hilarious
    • 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_off0000c98d.bin
2cac3e97283f97ff20a03854419b7a48542ad8f4e31f16b822140134f633e786
pdf-font-stream PDF embedded font (sfnt) at offset 0xC98D 17292 bytes
font_01_sfnt_off0000e36d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 16792 bytes
font_02_sfnt_off0000fb84.bin
a429983f98cdd2bcb362d749364ba8f60155894d2027c9257964738f5cac4033
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 10648 bytes
font_03_sfnt_off000113d8.bin
7ef45275b0d780cb7cfad5f195069a56c4e332fd4a5de8f5d7a788687d14ab9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 21172 bytes
font_04_sfnt_off000147f5.bin
ee54630999abfb51d0f3a76251ca78c1b89429945d98ccf1d55709d12490b121
pdf-font-stream PDF embedded font (sfnt) at offset 0x147F5 8464 bytes