Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c6235a669a0565…

MALICIOUS

PDF

78.8 KB Created: 2021-09-10 00:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19335ac9534821a865a5a6b0382b5802 SHA-1: 8e79aa8d1e5ccca24ee34cf0bc912c82f7e0c7ac SHA-256: 29c6235a669a0565f4b7fbe0696d55e66cb6cc616ab9e310cef99116cd09484e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The document's structure and embedded links suggest an attempt to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://envigest.cz/upload/file/dejudolowusajurilibu.pdf In PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/77606468707.pdfIn PDF document text
    • https://senegal4d.com/contents/files/49178221127.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/58100432336.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/podixefavexakibo.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/rujafuwudowokesopufo.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/20759190269.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/lijukilokiduj.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161325152512aa---zavedasirowoteke.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7fcbda624---9985308187.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/38671135146.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306253710c6---56986807677.pdfIn PDF document text
    • http://teknis.it/userfiles/files/salowoxobapa.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/84438868943.pdfIn PDF document text
    • https://limsurdua.com/contents/files/24809261147.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/5879247368.pdfIn PDF document text
    • http://bwc.lt/i/79364385268.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/buxonefivopoxinudixog.pdfIn PDF document text
    • https://desco.scp.hr/files/82261638718.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/33621717757.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/47697173865.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33a59382524cfe34bbe6b0b67c0e935a/gegukovivevum.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/65861070570.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613837e2a4b3c---86740051946.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/67353235477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+reduce+text+size+on+androidPDF link annotation
    • 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_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 10656 bytes
SHA-256: 1b9fd68e656fc66e8c62ef24ad573f951c840ae414067f7ff5eac5311f80b16f
font_01_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 18716 bytes
SHA-256: cd7c2f456c94b7699ac177f59698ef86ffb55ffda9b4a69947cd9c4980dcb381
font_02_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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