Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7daa47f92486b0f…

MALICIOUS

PDF

89.1 KB Created: 2021-06-25 12:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8ca98279780f0efffde4f8ac93c2b17 SHA-1: 02c8394b06ccca146bad024b75cdf073a5a9b9e2 SHA-256: a7daa47f92486b0fd1ef2f73f29058b5102c7863f99f51385cba461c5f09daf9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress installations. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=inspiron+psychological+well+being+centre', likely serve as lures for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://smidgel.ru/uplcv?utm_term=inspiron+psychological+well+being+centre
    • http://huucodatlanh.com/userfiles/file/wusojaposimenom.pdf
    • http://aimic.com/userfiles/file/matixogidarizeguja.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e2efe01d1---35762835472.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00510c107---xarixomalerefuziruxorudor.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec53966681---75751756390.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/468fa4c0f7a179f49b92ef9fd6f6c20c/21550897637.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160782829e00b1---lujukebarel.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717af392ff1---rusowatitekixu.pdf
    • http://romangruszecki.com/uploaded/file/44495814578.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4npf0uu8hgcp1m9to085v0lmk3/18659449417.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/euihhvv4vsthehjk4ci24cjgds/xakosuperosegom.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076171fc7d12---dabovelife.pdf
    • http://angelcabrera.com/FCKfiles/file/jodejawuwi.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_off0000e24d.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 16164 bytes
font_01_sfnt_off0000f7c4.bin
1ce690170dcc348e1778eb385719144f1eb0401e01b3c93b4b6bc315b15863b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10944 bytes
font_02_sfnt_off000110f1.bin
b319278dc369a264b988b1a21217fbff3da4cb8b48e8caf95be56ed5aba74e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 17640 bytes
font_03_sfnt_off00013f3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3A 16792 bytes

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