Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa2b852c150c99f…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 12:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 878366e50f3256e1d20017dad89a78e9 SHA-1: e176cdea169d7127f5b0e278921bb3cfe5d76605 SHA-256: daa2b852c150c99f7d820c1246d305fabf04418e51946efc8c9c06f126e4360b
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, many pointing to compromised WordPress sites and raw IP addresses, indicating a likely phishing or malware distribution scheme. The document body is unreadable, but the heuristics strongly suggest the intent is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smit-electronic.hr/upload/datoteke/53947329776.pdf
    • http://goldcoil.com/uploadfiles/files/darikodifi.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d188cc5acf9f30fbbaee72c62eecef9f/51891808812.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/65e6p630i1728i5e7cj49arej3/97667019525.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/3699f049b4dfdf5eb125519f5b337e0f/remodupipasirudawi.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f427f6321d---27619838814.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8e675bef---wufixenamu.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa764c19561---mejexeta.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608d48d4d95ca---52031809597.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d628376511---betapewuwegedemade.pdf
    • http://lumieretvie.com/userfiles/file/wadafose.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa8c5f57a---zujegulowubudagixezojeve.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a014c5d5a---86074312729.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b9f62ebc2aad5e007e1732448fc51490/wegafepufotepob.pdf
    • http://aybar-gallery.com/userfiles/files/lajorirose.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609e79b2693d4---86290079513.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937317b53f---lalibedo.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/62753070355.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/rozurubumalepebufijivitof.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/82r1bmvi46gp3omgo83fmoelno/33930330014.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8a3aab5e670e37f042aa6046771d7523/65703543840.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/11vicihe0r5lkdunb7ctdofg73/lixinorovun.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20bb96a2f---fojikedoforatikunu.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081880676efd---43220765476.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=25g+flour+in+cups
    • 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_off0000e703.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 16792 bytes
font_01_sfnt_off0000ff15.bin
24de840a51bd9fc6a4e53e33fadefa1c926cfe63ca4438dae7f5919566948f8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 16416 bytes
font_02_sfnt_off0001299b.bin
fed27371f1a2fa0d23d2bab2e732a4916b99f7aba00ad7fc0fbaf6799dd436ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 10520 bytes