Malicious PDF — malware analysis report

Static analysis result for SHA-256 408e278954fc9f22…

MALICIOUS

PDF

93.2 KB Created: 2021-07-07 12:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b8e965c2b7de35247cf0f0dc5f07f73 SHA-1: 208965ba33d49cac31714bd61492323649a24fd5 SHA-256: 408e278954fc9f226a614f2f9ce9da2ca358e466df2a16e9982fce261f5a1f9f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4705d48c03---jovagekuzimepokufanesobu.pdf
    • http://sattosushi.com/uploads/files/92616886250.pdf
    • https://acryl-bg.com/userfiles/file/goxixapil.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098560d404f9---80456900108.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070155ce69fb---32770206076.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/2333126980.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/rubanutugawebiwipofagi.pdf
    • https://allcreaturesinc.com/files/files/71030394365.pdf
    • https://sanidom.pl/img/file/kevomo.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099332da44e3---xidekolerukurubipiv.pdf
    • https://saunadlaciebie.pl/userfiles/file/34119971764.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e573737---rowowonawuxozuwa.pdf
    • http://chickenwild.com/upload/contents/images/images/dafonunofusi.pdf
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/kojisobijixopusomuf.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2fed39ca29de97a326fcb5f6c7c1ef0a/32310367146.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9e448c9ca3a7693e75371e4392c07581/vobiwajuporebowikili.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/cb554ce81a302ea6560bcf7cf80a1e9b/mokipowenebukaxixovaseliv.pdf
    • https://atcotourismtravel.com/userfiles/file/98984766767.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608126bd8a5b9---5258882902.pdf
    • http://antifftech.com/uploadfile/file///2021070303492462.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c42150a4936---92600012294.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acac67265b7---tesudi.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd98f2c24---kupifimitotafi.pdf
    • https://trouver-une-ssii.com/img/pics/files/zosunajibas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+ocean+at+the+end+of+the+lane+sparknotes
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 16792 bytes
font_01_sfnt_off0001070b.bin
405216c4a125ba6f4877352f8df021a366849713923919a15c47f405c8044a16
pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 18136 bytes
font_02_sfnt_off000123b2.bin
f7901f21242ded6e840785aa66b97585d662a59501f1ec23732cd1b8661c2a28
pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 10680 bytes
font_03_sfnt_off00013c27.bin
22f5bc4d6955ab28252dad3639756a1581cec582071bc34faf3f031d20df9881
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C27 16364 bytes