Malicious PDF — malware analysis report

Static analysis result for SHA-256 54083501cbbbaa47…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 03:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d7e16447be6bcc6b702b29a1fff607b SHA-1: 67cca43c88f67857d9ce444ed2faa178b5f37db2 SHA-256: 54083501cbbbaa4710a8cecb2922393a5366f31962caf2e6f60c52962a89dac7
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external links and the detection results point to a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bronia.org/userfiles/file/nafado.pdf
    • https://midasspa.com/ckfinder/userfiles/files/47215207671.pdf
    • http://aliceinformaticasrl.com/user/pages/vuxeganakopujiralelawuju.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818ece78632---4190383907.pdf
    • https://magerp.org/upload/files/68726299789.pdf
    • http://nfraccon.org/userfiles/file/89537000523.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087015fb3611---vifimulutegux.pdf
    • https://fceresources.com/ckfinder/userfiles/files/warekobewenaligi.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/668491dca26e31c4b2de58164b72b96e/20376962653.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609864813d87f---72343876735.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f3279544b---68589748876.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/j5n7lh3gjcmem6ogpq3ikp42u4/78071663892.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160abfec7ba9a0---sikukabugozafu.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd839ba907775b859a6f933c9bda2fc4/fokid.pdf
    • http://bebelino.ru/userfiles/file/79828799280.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608846ef3242b---72639923605.pdf
    • http://arniestribu.com/campannas/file/bekob.pdf
    • http://www.yoko-ono.be/images/userfiles/file/xiwozevuvuvijoriwaxikuzox.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac45e8da93---36095713166.pdf
    • http://conelser.hu/fck_uploads/file/repinodosufir.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-23/20210623002716421420.pdf
    • http://diclenakliyat.com/userfiles/file/xeratapefugigo.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25e13357c---53676546810.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ef4fcefe5170df3993abb485c6b441b3/retuxokixeniverera.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=candlestick+swing+dance
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ec99314c8d52acfa2ad086098f358e53/12153172856.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_off0000ea59.bin
9c3c50ca7885eb1b87261f6f74ba185aca171ae216209544253fbc3ee3acc073
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 1720 bytes
font_01_sfnt_off0000f27b.bin
a36940090491ca7b0ad026cac743d31ba93136f33518d2d2f04e156b193ccfa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 18112 bytes
font_02_sfnt_off000121f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 16792 bytes
font_03_sfnt_off00013a07.bin
d698e348dc57ada01e2b8a1d188af9c70734414c70c3cfc854751975d6bec348
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 10532 bytes