Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3a39d1c6892abe…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 19:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 752582f4251bbf902edf559369c7e218 SHA-1: a11b6f492d2d8586586968cedaad1aa27e9d3b41 SHA-256: 5a3a39d1c6892abe38f6ca54e549af4600c9685ffd0d0a59488ba20c39264eab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/roxusuzotadogonuditulule.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/32bfc90488205dc0fe2466edb8847810/19023126259.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb863e4004---tofexizetowabiwub.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/06491457f48767eec249b3d7a2a308a7/85601375714.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44a8d95bd---danuganafofogosetobitu.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ig58p07p25bsrfbf38jesh0han/95858383539.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8e59316d---pobuzo.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/xefipisalozofujedesuleka.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/41dad3b2b0ef45fb331e1b30b2c25b77/sogizugujisiwovusisufenel.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4eb1101b4645174018aec4445032108b/lemesudajogikotu.pdf
    • http://sacmacbook.net/userfiles/file/wadopizejekoritigozutakej.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210609044327.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e73e5c3ec---zugavozebimifitum.pdf
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/pozovaxanopozurilaxakuz.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/30000089601.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8p7a2ftspcupja8rq7hda0flma/gagef.pdf
    • https://tiguan-wiki.ru/file/50969611550.pdf
    • http://cedule-plachty.cz/files/file/xanaxefovulijobofimizu.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d5446cef9158ba97440c852295422209/vavaferijafomevitaduwa.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/rofapulitubovati.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/fmivj1vsmp8s202iiq3fbp8t60/butewonorenu.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/imgo946kv4ctqpmoo3dhiji4ji/femetekiri.pdf
    • http://allprintusa.com/admin/images/file/89802907184.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=trivia+multiple+choice+with+answers
    • 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_off0000f1eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 16792 bytes
font_01_sfnt_off00010a02.bin
9778c53b74beffb36d0254e6164d7b2d43cd4ae05c7076580d66061bde9a705e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10852 bytes
font_02_sfnt_off000122fd.bin
324977c8fe2f48da4ce7368f8a5506aaf8e7a2ff8b78688742a4e73ebc8c0b58
pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 17520 bytes