Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b25aa7ff47f39a…

MALICIOUS

PDF

206.8 KB Created: 2021-07-01 22:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14eccd6548894a1febbae68c1d4bb884 SHA-1: 03c33405846f912709420614df57069eb2f3fa2b SHA-256: f3b25aa7ff47f39a24050f731fb74e18fcc60a7a30e0da32da935e1a8aba8803
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the presence of numerous compromised upload links suggests a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9509

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c859955da6---37767797341.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a367a0a94a2---91391333679.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b492a96759---21967491322.pdf
    • https://abugfreemind.com/userfiles/file/daxeluniruxel.pdf
    • http://vasvaripalmuzeum.hu/upload/file/33827704164.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ef194d5699b762443a3d5d7e4712657c/tesamoruxevizexakadusof.pdf
    • http://sahamit.net/userfiles/file/lenopojofiporujexemovupa.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/76042685763.pdf
    • http://hzjksj.com/images/upload/File/kixekolupivavux.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7fab4f88---xakizulerira.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e622ada99---nopijig.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/477175n6en1dgg96n4fh0e3004/61175744501.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/02c23ab850e4f04981bf1923c12cc857/rufurawi.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/05e4rpil094mfgpnheojvmpnl9/24175472821.pdf
    • https://repare-ton-smartphone.com/userfiles/file/tozajokox.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b3b8a9959a31375a134aa5b6683b22ea/jinuzota.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jmogml0eh3epn9lcunh0jsacs1/moxabinasagazemelaselure.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070012094e6b---mukurikikosufalewanode.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/86459fa17a9cc41c2c3bcf60cd203c48/68208203790.pdf
    • https://ludifrance.fr/userfiles/file/3141177776.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081071a1f2e2---91079630572.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/86f018c421811aecdba0918bf00eb013/bivezumejolufame.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d95c53a1c61---wigejenimitilevewa.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef2429034f---29613947069.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a2edf576c303aae8e744b5f342b6b84b/fajagevi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=design+of+composite+steel+and+concrete+structures+pdf
    • 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_off0002abb4.bin
1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
pdf-font-stream PDF embedded font (sfnt) at offset 0x2ABB4 16168 bytes
font_01_sfnt_off0002c14c.bin
fb08108f51cca777e2c42842f18d825710caa909600dac824c0fec7a18d17368
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C14C 21560 bytes
font_02_sfnt_off0002fa2b.bin
52b5a23e16108c08ff986f49341ca71a747510d830a982aca74b07c53934f722
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA2B 11064 bytes
font_03_sfnt_off000313c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x313C3 16792 bytes