Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d3f0ad4b71f9a3…

MALICIOUS

PDF

89.7 KB Created: 2021-06-30 20:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 229ed67f9c4c74d632895813c8161bcb SHA-1: 1cf565eff0f27ff06d507c27ca54d3e2dc3c4f88 SHA-256: 14d3f0ad4b71f9a3d8eba5d297a4bc11648dd80141693e98f539933c56591af9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs and link farm structure suggest a phishing or malware distribution attempt, likely using a lure related to Outlook 2016 attachment issues. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to deceive the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://pistant.ru/uplcv?utm_term=outlook+2016+blocking+pdf+attachments
    • http://skomi.ru/img/files/file/tiranu.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/188b02a244bc898e2b675ac42d3aece2/46466696816.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091653b95e3c---nojixufitepabepikura.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4430dea0b---runitivezewipa.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/87e8c3341e1715362dc606cf3ea0b9e2/4214455105.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8cc0527c---lapubunujilofasi.pdf
    • http://hum-lucknow.org/test/fckeditor/file/94467999470.pdf
    • https://armandofalconi.net/userfiles/file/97735507422.pdf
    • http://allnatureint.com/userfiles/file/legaxamelu.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe010ad9e2---62253486376.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ecbb014a5---watojewuwaji.pdf
    • http://assytekservizi.com/userfiles/files/65050235098.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b595176df72---55363976233.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dba9b5666---totajil.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xikerarup.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/66a8a34790ef3545aa8ef5255631ae34/46242849589.pdf
    • http://zlato-invest.cz/upload/files/8342639498.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5006fe96a3---verufaveliluwapibivodonor.pdf
    • http://koryosushi.com/uploads/files/lekotila.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160832e2aa8748---69151660527.pdf
    • https://annjulieskarpmo.com/userfiles/file/medumedikoxesilofupal.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4a996169db9a986c7118ff692337aeb3/notozupofixetafulo.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3c5e22de---55869138664.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/558ea9887e237d54708fd649b406c547/mitonagiseme.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0a4382477b927ce7734244bdb09e7474/38273612128.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 16792 bytes
font_01_sfnt_off000112c9.bin
0395c05c9e0fb5ccfe0817d3b6acdb7f715bcf99e222ed9722a580e146244f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 11784 bytes
font_02_sfnt_off00012e75.bin
b4181086f774da32c9af35128d1439458be093bb9eaa80214d6edd91f4f28ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 16580 bytes

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