Malicious PDF — malware analysis report

Static analysis result for SHA-256 997995d68a865ddd…

MALICIOUS

PDF

81.5 KB Created: 2021-06-29 21:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5212b6e91479dfbcaaa6b097598f1bcc SHA-1: 1428a20ae0d3f33b93f87e985b32acf7a3f08d7a SHA-256: 997995d68a865ddd8ac98fc145f36c23d4b136365c261ddc8c4f4a574158b0df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body was unreadable due to encoding issues, but the heuristic firings and URLs are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=spider+gif+funny PDF link annotation
    • http://albatrossmrn.com/konadnew/userfiles/file/35174590796.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/56357095401.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608968be9fe4b---vivelejazegijenawiteku.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071453bc05b2---63704273511.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/xutumitubogajukurenavirir.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/tedc07f6ilrhs035ujg8c7vmu5/pabozetodevone.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/939947d1268545c7d11aaadb260d376c/49538032147.pdfIn PDF document text
    • https://corghialberti.it/file/47875767406.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6d7773c88---577030379.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/40aa775436ce51f407c9fd909862b478/wuvopenometepitagemoxige.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/89819612630.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b9b23f50df15bfbf6e62aec147dfa7af/fuwupomumexefinu.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/52335164288.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b842d189---61847774452.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/dutex.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/aedbbd4cba1434f6e0811387d970e82b/63281009282.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/3854925667.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ob4q83tr0ikqoubcks2fa1den9/92475112284.pdfIn PDF document text
    • http://navigator-33.ru/media/file/rotofarugivipomirojofa.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o67nq3ekngd6e09ugp8m9ai64b/wixividirusujalezarilekif.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de57f078b8dcc4f95630ba9fa052886f/10502904962.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a8396d2ac---mulamigoganafetexizatol.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e7eca4af35623be76884dac37661ad7b/11904613473.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874baf6a042---bugojinej.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 10368 bytes
SHA-256: ee90d15b596d37fc32cd8387c7cfbb04b8f6ded10e3d83646914383ca2ce88dc
font_01_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 17500 bytes
SHA-256: 26f83662fbcfd0071d7aabd49fed4d65d52c31e67b2c7eabe1cee0347afaf902

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